Gelonghui November 29 | *ST Tianshan announced that recently, the company was unable to get in touch with Ma Changshui, the company's chairman through phone calls, WeChat, etc. After communicating with Ma Changshui's family, up to now, the company is uncertain about the specific reason why it was unable to get in touch with Ma Changshui. Ma Changshui has not held any other position in the company except as chairman of the company, chairman of the strategy committee of the board of directors, member of the nomination committee, and member of the remuneration and assessment committee.