There are lots of stellar pairs in the universe, but all are interacting and exchanging matter with one another because they are so close together.

宇宙中存在许多双星系统，但是由于彼此间离得太近，它们全部都会发生交互并进行物质交换。

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Architects will place buildings close enough together so they can cast shade on their neighbors and ensure normal cars won't be driving through the streets.

建筑师将建筑间距设计得足够近，这样可以使建筑互相提供荫庇，同时也确保普通汽车不会在街上行驶。

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They were sitting so close, their heads were together.

他们坐在如此接近，他们的头都挨在一起了。

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"The two games are so close together that they were always going to be played at the same venue, " added Cumbes.

BBC: Blackpool can host Lancashire fixtures - Jim Cumbes

Fusion is the process of forcing the nuclei of atoms so close together that they fuse into a nucleus of a new element. (Fission, of course, is the opposite: energy produced by splitting nuclei.) The new, fused nucleus weighs less than the original two.

FORBES: A Nuclear Hybrid

They keys have the same flat, close-together design they always had, so don't be put off if you see these on the shelf at Best Buy.

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