They're high-voltage cables that allow two or  more countries to link their electricity systems.

它们是允许两个或多个国家连接其电力系统的高压电缆。

It combines the link system and peg methods in a way that makes a very powerful tool for remembering long lists or quite complex information.

它将链接系统和挂钩方法结合在一起，成为记住长列表或相当复杂信息的非常强大的工具。

Reptiles, amphibians, most birds, and monotremes like the platypus have a cloaca, a multipurpose swiss army knife of holes, linking the urinary, waste, and reproductive systems… I guess you could say: one ring to rule them all.

爬行动物、两栖动物、大多数鸟类和像鸭嘴兽这样的单孔类动物都有泄殖腔，这是一把多用途的瑞士军刀，连接着泌尿系统、废物系统和生殖系统… … 我想你可以说：一环统领它们。