be used for 和be used as 用法上的区别是什么?

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be used for 和be used as 用法上的区别是什么?
be used for 和be used as 用法上的区别是什么?

be used for 和be used as 用法上的区别是什么?
be used for:用于
1.Aluminum foil can be used for wrapping food.
铝箔用于包装食物.
2.The extent to which a program can be used for similar but not identical applications,perhaps with slight modifications.
一个程序可能经过稍许修改就能用于各种类似但不完全相同的应用方面的程度.
3.Another might be used for control purposes; changing the mode of the controller.
另一个则用于控制目的,用来改变控制器的运行模式.
be used as - 是用来做什么/用处的意思.
The National flag is used as a symbol of the Country.
国旗代表着国家.

举个例子更直观
比如说笔用于学习
Pens are used for studying.
笔用做学习的工具
Pens are used as a tool of studying.

be used for表示被用来做什么，后面加用途
be used as 被用来作为什么，意思是以…的身份, 以…资格, 作为

The pencil-box is used for keeping pens.用于做...
This glass is used as a container.用作...

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