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1·The rule is that you pluralise the head of the term.

名词词组复数变化的规则就是：变“重点词”。

2·But English is pretty simple: verbs hardly conjugate; nouns pluralise easily (just add s, mostly) and there are no genders to remember.

但英语其实很简单：基本没有动词变位，名词变复数很容易(大多数情况下只用加字母“s”)，而且无需记忆词性。