Larry Xiangdong Chen
Analyst
Thank you, Sandy. Good evening and good morning to you all. Thank you for joining us today on our fourth quarter and full year 2020 earnings call. As you know, net operating cash flow is an essential indicator to measure the operation efficiency of online education company. In the fourth quarter, we achieved net operating cash inflow of RMB636 million. And for the full year 2020, our net operating cash flow remained positive at RMB603 million. In December 2020, we successfully completed a private placement raising US$870 million. As of December 31, our cash and cash equivalents, short-term investments and long-term investments totaled RMB8.22 billion, a significant increase from RMB2.74 billion as of the end of 2019. In the fourth quarter, our selling expenses totaled RMB1,798 million, a 307% year-over-year increase, deducting RMB472 million in employee compensation and miscellaneous expenses and RMB59 million in brand new activities takes us to traffic acquisition expenses of RMB1,267 million. Since our gross billings for the fourth quarter were RMB3.15 billion, the corresponding ROI kept us in a superior position in the industry. Further our selling expenses in the fourth quarter decreased by RMB257 million or 12.5% from the third quarter. We moderately controlled our traffic acquisition expenses, because we firmly believe that good education takes time and it should be full of care and love. Premium, respectable and sustainable education is never about shortsighted race to expand, but should increase great teachers, high-quality courses, caring services, effective learning results, and excellent reputation. I have always been reminding my team that when we saw the gigantic capital injections into our industry, the massive marketing campaigns that followed and the irrational race by some players to scale their businesses at any cost, we should always keep calm and stay true to our original mission, which is to focus on making education better through technology, focus on recruiting and training the best instructors, focus on providing the best and the most caring education, focus on offering the most satisfying services to each student and each parent, and focus on pursuing the right growth regardless of hardship with a long-term and sustainable view. In 2021, we will continue to expand our recruiting and training of star instructors, expand our efforts on content, product and technology development, maintain an effective growth strategy on a lifetime value basis. Optimize our operational efficiency and effectiveness, and to further improve our organizational capabilities and efficiency. We are confident that we will continue to excel in terms of operating efficiency in 2021. Now, I will pass the call over to our CFO, Shannon, to walk you through our financial and operational details.