What we really want to do is express df only in terms of dz.

我们想要的仅仅是。

youdao

Did not know how to use DZ subsequently, do not know DZ at all before.

随后不知道如何就用起了DZ，以前根本就不知道DZ。

youdao

Did not know how to use DZ subsequently, do not know DZ at all before.

随后不知道如何就用起了DZ，以前根本就不知道DZ。

youdao