"I want to emphasize our commitment to the Nigerian market,". "This new flight is a key part of Delta's African expansion and ensures that we maintain our position as the number one US carrier to Nigeria and more broadly to Africa."

VOA: standard.2009.06.13

No. 2, we believe that young people have to be a key part of building that ethos One of the reasons for that is purely demographic.

其次，我们认为青年人,必须成为建立该社会风气的主力,其中的一个原因,纯粹是从人口统计学来考虑的。

普林斯顿公开课 - 人性课程节选

having more capital, standing for a set of values is a key part of our power.

拥有更多资产，坚持价值观,是力量的关键。

普林斯顿公开课 - 国际座谈会课程节选

And so that's the part of the brain that's the key part of a body for the purpose of personal identity.

所以大脑,这个身体最关键的部位,就是人格统一性的关键。

耶鲁公开课 - 死亡课程节选

Because standing for our ideals is a key part of our power.

因为坚持理想,就是力量的关键。

普林斯顿公开课 - 国际座谈会课程节选