From a distance, they shot at each other. Close up, they cut each other with knives.

VOA: special.2009.09.03

What we're going to do in forming a molecule is just bring these two orbitals close together such that now we have their nucleus, the two nuclei, at a distance apart that's equal to the bond length.

我们在形成一个分子时要做的就是,把这两个轨道放到一起,这样我们有他们的原子核，两个原子核，它们之间的距离为键长。

麻省理工公开课 - 化学原理课程节选

but within close enough walking distance to this trail.

但是离这个栈道很近。

罗宾·威廉姆斯的家 - SpeakingMax英语口语达人