I can take you and immediately start designing batteries, because we need ions in motion, we need small ions in motion.

我可以从此让你快速起步设计电池，因为我们需要能运动的离子，我们需要能运动的小型离子。

麻省理工公开课 - 固态化学导论课程节选

I think the reason why triathlon is not so, so big is just because it requires a lot of time.

我认为铁人三项运动之所以不够普及，
是因为它需要大量的时间。

对体育项目的热爱 - SpeakingMax英语口语达人

Unless, of course, you're a smoker, or you're thinking of becoming a smoker, and then maybe you should worry, because this is one of the advertisements that was airing in terms of anti-smoking campaign.

除非，当然，你吸烟的话，或者你正考虑开始吸烟，那么你可能就需要担心了，因为这是反吸烟运动的,宣传内容之一。

麻省理工公开课 - 化学原理课程节选

The great discovery that Galileo and Newton made is that you don't need a force for a body to move at constant velocity.

伽利略和牛顿的伟大发现就是,物体不需要力来维持匀速运动

耶鲁公开课 - 基础物理课程节选

I mean all those of you doing sports here-- and it's most of you in this room who are doing athletics, who go for a run, you rely on the law of gravity.

你们中喜欢运动的-,教室里多数人都做运动，跑步时需要万有引力定律。

哈佛公开课 - 幸福课课程节选

It's very clear you don't need a force if something is doing nothing, just sitting there.

显而易见,如果物体没有运动,只是静止状态,那是不需要力的

耶鲁公开课 - 基础物理课程节选

The fact that you don't need a force for it to move forever at a given speed in a given direction, that's not obvious, because in daily life you don't see that.

对于物体不需要力的作用就能保持,确定的速度和方向持续运动这一事实,它并非显而易见,因为在日常生活中你看不到这种情况

耶鲁公开课 - 基础物理课程节选

The summary is that constant velocity doesn't require anything.

概括起来就是,匀速运动并不需要任何外力

耶鲁公开课 - 基础物理课程节选