在5万名听众面前，他提出了一些务实的建议：你必须知道自己在说什么。

Before an audience of 50,000, he gave some pragmatic advice: you gotta know what you're talking about.

youdao

在5万名听众面前，他提出了一些务实的建议：你必须知道自己在说什么。

Before an audience of 50,000, he gave some pragmatic advice: you gotta know what you're talking about.

youdao