WE will give you a machine that works .We will exchange this one .将We will exchange this one.提到句首后变为了We will exchange this one for a machine that works.为什么要用for?

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WE will give you a machine that works .We will exchange this one .
将We will exchange this one.提到句首后变为了We will exchange this one for a machine that works.为什么要用for?

exchange A for B,用B来代替A,是固定搭配.原句的意思是,我们将会用一种有效的药来替代这种药.