A navigator needs to know what time it is on his ship and also the time at another place of known longitude -- at the very same moment.

VOA: special.2010.07.14

Of course, she needs to know the basic principles, but she's also talking about it an enzyme, so she needs to know about enzyme catalysis.

她需要知道这表上的许多东西，当然她需要知道到这些基本原理，她研究的是一种酶。

麻省理工公开课 - 化学原理课程节选

It's that I may satisfy some of those needs, but I also hope that I'll convince you that there's a different kind of needs that I can provide.

你的这些需求我能满足一些，我还希望你们了解,我还可以满足你们,另外的一种需求。

麻省理工公开课 - 电影哲学课程节选

You want that shield up so that it pretty well meets your helmet, so it's going to be at a certain distance but it will also go down to where it needs to go down here.

盾牌上缘能与头盔配合保护上身,所以盾牌和身体是要有一定距离的,而盾牌的下缘用来保护下半身

耶鲁公开课 - 古希腊历史简介课程节选