史蒂文正在和朋友露茜谈论环境问题。
Steven is talking about the environment problem with his friend Lucy.
一旦语言从2岁左右开始发展，他们就有了一个符号表征系统，可以谈论过去和现在环境之外的事情。
Once language starts to develop from about age 2, they do have a system for symbolic representation and can talk about things which aren't in their immediate environment including the past.
在休假期问，她在国际上谈论了环境问题。
During her vacations, she spoke internationally about the environment.
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