both的用法：both可作代词和副词两种词性，基本含义为“二者都”、“两个都”、“不仅…而且…”、“…和…都”、“既…又…”、“两个”，常与复数名词连用。
both的基本含义及用法介绍
1、当both作为代词时，意为二者都;(与复数名词连用)两个，两个都;不仅…而且…;…和…都。
例句：Both women were French.
两名妇女都是法国人。
Both his mother and his father will be there.
他父母二人都要去那里。
She cried out in fear and flung both arms up to protect her face...
她吓得大叫，并且抡起双臂护住了自己的脸。
Both are the result of social environment.
二者都是大环境的产物。
Both views go against the view of scientific development.
二者都是与科学发展观背道而驰的。
They're both beautiful ─ I can't make up my mind.
两个都很漂亮——我难以决定。
They're both beautiful ─ I can't make up my mind.
两个都很漂亮——我难以决定。
2、当both作为副词时，意为（与复数名词连用）两个;不仅…而且…;…和…都。
例句：Chinese cooking is both low in calories and healthful.
中餐不仅热量低，而且对健康有益。
I believe that such a policy is both wrong and impracticable.
我认为这种政策不仅错误，而且不可能实行。
Depression is both prevalent and dangerous.
因为抑郁症不仅很普遍而且很危险。
Acceleration and velocity are both vectors.
加速度和速度都是矢量。
The Ukraine is strong both in industry and agriculture.
乌克兰的工业和农业都很发达。
