Core holes should be drilled as vertical as possible.

取芯井应该尽可能垂直钻探。

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The black holes sink to the centre of the cluster, where a core that is completely made of up of black holes forms.

黑洞向星团中心沉降，在这个区域，形成了一个完全由黑洞组成的核心。

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In the core, the black holes experience a range of interactions, sometimes forming binary pairs and sometimes being ejected from the cluster completely.

在星团核心，黑洞经历一系列相互作用，有时形成双黑洞，有时被完全抛出星团之外。

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It is also commonplace for the temperature in core holes to be measured.

ECONOMIST: The hole story of global warming

Cow-occupied Vermont is touted for its ice cream so if you want to lower your core body temperature, it runs a close second to swimming holes.

BBC: The secret swimming holes of Vermont

In the polar regions, even the smallest of holes in your warm clothing can have major implications on your core temperature and survival.

BBC: Sir Ranulph Fiennes: Coping with extreme weather