Our revenue growth was supported by the growth across all business lines in all cities. Small Class which consists of Xueersi Peiyou Small Class, Firstleap, Mobby and some other educational programs and services accounted for 80.9% of total net revenue compared to 85.1% in the second quarter last year. Peiyou Small Class which remains our core business represented 73% of the total revenue compared to 77% in the same year ago period. This lower revenue contribution from Xueersi Peiyou Small Class was mainly due to the faster growth of online course business and the consolidation of the newly acquired businesses. Net revenue for Small Class was up by 58% in dollar terms and a 62% in renminbi terms, while the enrollment increased by 77%. Xueersi Peiyou Small Class revenue generated from cities other than top 5; Beijing, Shanghai, Guangzhou, Shenzhen, Nanjing, grew by approximately 70% in renminbi terms. Cities other than the top 5 accounted for 42% of the Peiyou Small Class business, up from around 48% in the same quarter last year. We have achieved a triple digit year-over-year renminbi revenue growth in terms of the 25 cities that we have entered by the second quarter of fiscal year 2017, including Jinan, Shijiazhuang, Changsha, Qingdao, Luoyang, Nanjing, Ningbo, Hefei, Wuxi and Fuzhou. The revenue growth across all cities was driven by incremental ramp up in enrollment from our early classroom expansion. Let me give you an update of the summer promotions. We offered summer promotions in Beijing and a limited number of cities given the retention rate into the short term of these promoted courses, we expect the enrollment growth in the coming quarters to continue to grow robustly. For our one-on-one business we had a good second quarter and achieved a year-over-year revenue growth of 96% in renminbi terms. Zhikang one-on-one was in strong demand partially driven by the growth of our Small Class business and also benefited from normal price increases. One of our increase including overseas consulting business accounted for 12.1% of total revenue compared to 10.5% in the same year ago period. Turning to our capacity expansion, in the second quarter we added a net eight new learning centers. During the quarter we added 489 Peiyou Small Class classrooms making the total number of Small Class classrooms increased by 74% year-over-year, due to strong demand for our services across all cities. We added most of the Small Class classrooms in Beijing, Tianjin, Guangzhou, Shenzhen, Nanjing, Hangzhou, Zhengzhou, Suzhou, Jinan and Wuxi. During the quarter, we entered one new city of Zhenjiang. As always following some renovations and other preparations these classrooms will gradually run perhaps through utilization as we saw last year. This new capacity expansion will be beneficial in giving us more leverage in the second half of the fiscal year. We continuously review learning center performance on a routine basis and we have reduced nine one-on-one learning centers. This quarter we also opened two Firstleap Small Class learning centers in Nanjing. By the end of August we had 575 learning centers in 68 -- in 36 cities across China of which 409 were Peiyou Small Class, eight were Mobby Small Class, 58 were Firstleap Small Class and 100 were Zhikang one-on-one. Looking to Q3, given that the peak of our planned capacity expansion has happened after summer but this contract of some new centers were completed in October. We estimate that 20 to 25 Peiyou Small Class learning centers to be added. Moving to our online business, in second quarter, revenue from xueersi.com grew by 144% year-over-year in renminbi terms. So growth momentum of online continued to be very strong. Online contributed 6.3% of total revenue this quarter compared to 4.4% in the second quarter of fiscal year 2017. TAL was the first mover in live broadcasting on xueersi.com, because we are very confident that about long-term opportunities for our company and brand. We strongly believe that innovative technology AI in particular will add a new dimension to effective tutoring and helping students excel in a personalized learning process. We also expect that innovation will greatly improve operational efficiency and scaling in the online live teaching model over time. [Luo] will slowly or further elaborate on this. Finally, on the revenue side per business line, other revenue is mostly from the online advertising business and represents 0.7% of total revenue in the second quarter. Let me now go through some key financial points for the second fiscal quarter 2018. In the second fiscal quarter, Small Class ASP in renminbi terms decreased by 8.5% year-over-year. The main reasons of the decrease are first a strong enrollment growth driven by the promotion activities in limited number of cities and second lower impact from price increases due to lower revenue contribution from the cities chosen for price increases for this year. Zhikang one-on-one ASP in renminbi terms increased by 12.8% because of normal price increases. Online course ASP was down by 14.1% in renminbi terms in the second quarter, mainly because of the increase of the enrollments driven by promotional courses. Cost of revenue grew by 85.7% to US$244.9 million in the second fiscal quarter from US$131.9 million in the same quarter one year ago. The increase in cost of revenues was mainly due to an increase in teacher compensation and rental costs, as well as acquisition of overseas or consulting business. Non-GAAP cost of revenues which exclude share based compensation expenses increased by 85.7% to US$244.8 million from US$131.9 million in the same year ago period. In the second fiscal quarter, gross profit was US$210.8 million compared to US$139.2 million in the same year ago period. Gross margin for the second quarter was 46.3% as compared to 51.4% for the same period of last year. Operating income increased by 32.6% to US$68.3 million. Non-GAAP operating income increased by 33.7% year-over-year to US$79.9 million. As we already mentioned the margin seasonality will be similar to last year, basic and diluted net income per ADS were US$0.11 and US$0.10 respectively in the second quarter of fiscal year 2018. Non-GAAP diluted net income per ADS were US$0.14 and US$0.12, respectively. From the balance sheet as of August 31, 2017 we have US$431.4 million of cash and cash equivalents and US$514.7 million of short term investments, compared to US$470.2 million of cash and cash equivalents and US$229.5 million of short term investments as of February 28, 2017. Capital expenditures for second fiscal quarter were US$37.6 million representing an increase of US$18.7 million from US$18.9 million for the same year ago period. The increase was mainly due to leasehold improvements and the purchase of servers, computers, software systems and other hardware for the company's teaching facilities and mobile network research and development. As of August 31, 2017 the company's deferred revenue balance was US$728.8 million compared to US$463.4 million as of August 31, 2016, representing an increase of 57.3%. Deferred revenue primarily consisted of the tuition collected in advance for the fall semester of Xueersi Peiyou Small Classes as well as deferred revenue related to the acquired businesses. Now I will hand the call back to Mr. Luo to highlight of our recent progress in exploring science and technology and our business outlook of the next quarter.