I've got to write an essay on electrical distribution systems, but I can't find any suitable books in the engineering section on level three.

我要写一篇关于配电系统的论文，但我在三楼的工程区找不到合适的书。

Because they do this a lot, they can damage electrical distribution centers by tunneling underneath with their little hands and big teeth, and preventing them from causing any damage once they're inside is difficult.

因为它们经常造成这种破坏，它们可以通过用它们的小手和大牙齿在地下挖隧道来破坏配电中心，而且一旦它们进入配电中心内部，要防止它们造成任何破坏就很困难了。