These proteins have functions that are essential for life of the cell, they transport molecules back and forth across the membrane.

这些蛋白所起的功能,对于细胞生存至关重要,它们负责转运分子通过细胞膜进出细胞

耶鲁公开课 - 生物医学工程探索课程节选

I feel like they could do a better job of getting trains moved in and out on time,

我觉得他们在让火车准时进出站方面可以做得更好，

坐地铁上班 - SpeakingMax英语口语达人

We have not yet perfected the art of entering and exiting this classroom yet, we're still working on that. Raise your hand if you need notes and we'll make sure we get those to you.

我们目前还没有把,进出教室的技术做的很好，我们仍在做这件事,如果你没有拿到讲义请举手,我们会被把讲义发给你。

麻省理工公开课 - 化学原理课程节选