But tensions remain between the United States and Pakistan, particularly about Mr.Obama's decision to continue firing missiles from unmanned aircraft at suspected al-Qaida bases in Pakistan's tribal regions, near the border with Afghanistan.

VOA: standard.2009.06.03

They do that because the bases can interact with one another in particular ways, and this you know about.

它们结构稳定,是因为碱基之间,以特定方式相互作用,这是你需要知道的

耶鲁公开课 - 生物医学工程探索课程节选

I think especially when you get to the UN with much of the UN's core bases, European..., the anti-death penalty, even beyond "women's issues".

尤其是牵涉到联合国的时候,联合国的那些核心基地，欧洲的，废除死刑，消除“女性问题“等等。

普林斯顿公开课 - 人性课程节选

The Obama administration says it looks forward to working closely and maintaining a strong alliance with the next Japanese government, but that it is ruling out any renegotiation of the bases agreement that was finalized earlier this year.

VOA: standard.2009.08.31

In fact, you don't have to draw it this complicated way, you could just draw it as a line with and hanging off of it, and you would know that that's a DNA molecule four bases long.

实际上你不必画的这么复杂,你只要画几个线条并标明连接的碱基,别人就能知道它是含四个碱基的DNA

耶鲁公开课 - 生物医学工程探索课程节选