It was scheduled to arrive in Tripoli at 6 o'clock " "We don't know where the communication failure happened, but what we can confirm is that were on board at the time."

VOA: standard.2010.05.12

if we can't think what system it belongs to, that's tantamount to saying we really don't know what it is.

我们就不知道它从属于哪个符号系统，我们就不能认识它了。

耶鲁公开课 - 文学理论导论课程节选

Milton's infusing this passage with a powerful sense of -- I don't know, what can we call it? -- of gender nonconformity and cultural relativity.

弥尔顿在这段中注入了一个很强烈的思想，我也不清楚，我们怎么叫这种思想呢？这种性别的不一致和文化的相对性。

耶鲁公开课 - 弥尔顿课程节选

But we really don't know what we can do until we stand up and try.

WHITEHOUSE: It's Work Creating Jobs, But It's Worth It

"What we don't want is that we promise something that we can't deliver, " Ms. Merkel said.

WSJ: Merkel, in Speech at Davos,

Social responsibility means that every time we see a problem, we don't just ask what government can do.

BBC: NEWS | UK | UK Politics | In full: Cameron speech