I first drilled the center hole in both plates in order to index them together.

首先，我钻出中心孔在这两个板块在以指数他们在一起。

youdao

I first drilled the center hole in both plates in order to index them together.

首先，我钻出中心孔在这两个板块在以指数他们在一起。

youdao