这些单词看似一样,却有很微妙的区别：
ordinary 普通的,平凡的
例句：
Ordinary measures will not do in a crisis.Extraordinary measures are required.
common 常见的
例句：
Sandstorms are most common in April in Beijing.
usual 平常的,惯常的,惯例的
例句：
A crime has been committed.The police will be rounding up the usual suspects.
general 一般的,广泛的,概括的
例句：
The problem is too complicated.I can only give you a very general idea of what happened.
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