Coreholes should be drilled as vertical as possible.
取芯井应该尽可能垂直钻探。
2
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。
3
In the core, the black holes experience a range of interactions, sometimes forming binary pairs and sometimes being ejected from the cluster completely.