没有那种重力帮助你摆脱困难，你将必须不断地推动自己，并且不是能保持的。

Without that gravity helping you out, you'll have to push yourself constantly, and that isn't very sustainable.

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研究者们发现，这种喷雾中含有一种叫“脱叶灵”的物质，也可以称作“TDZ”，它可以使叶子和花瓣看着比它们能保持的时间更新鲜。

Researchers found that a spray of a solution containing thidiazuron, or TDZ, kept leaves and petals looking fresh and healthy for days longer than usual.

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我能和他们保持牢固的友谊。

I've been able to keep firm friendships with them.

youdao

So, for starters we'll keep that as our zero energy, we're going to change it soon to make something that makes more sense in terms of bonding, but we'll keep that as zero for now.

因此，首先我们将会保持零点能的这个定义，但很快我们就会对它进行修改,使它在讨论成键时更合理，但是目前我们还是暂时采用这种定义。

麻省理工公开课 - 化学原理课程节选

Can you give us some advice on how to keep fit?

你能给我们提点保持健康的建议吗？

健康生活 - SpeakingMax英语口语达人

If you're an oil rich country today, as long as that oil lasts, you got the world kind of at your knees.

如果你今天是富油国,并且能保持稳定的产油量,那整个世界都会匍匐在你的跟前

耶鲁公开课 - 美国内战与重建课程节选