一位网友想知道动词 “gain”、“obtain” 和 “earn” 之间的区别，因为它们都有 “获得，得到” 的意思。想区分这三个词的用法，首先要知道它们能与哪些名词搭配使用。思考一下：在它们三个当中，哪个词最常用与名词 “experience” 搭配，表示 “获得经验”？

Trade negotiations between Chinese and U.S. officials in London entered their second day on Tuesday. U.S. Commerce Secretary Howard Lutnick expressed the optimism that the talks could wrap up by ...