China's Trade Negotiator Li Chenggang Says China, US Had In-Depth, Candid, Constructive Exchanges On Issues Of Common Concern Including TikTok; Both Sides Acknowledged Stable Trade Ties Is Significant; Frictions Are Normal, Important To Respect Each Other's Core Concerns; Important To Find Solutions Through Dialogues; On TikTok, China Always Opposes Politicizing Tech Issues; Will Not Sacrifice Interests Of Firms In Order To Reach Deal; China Firmly Safeguards Chinese Firms' Legitimate Rights And Interests