在那时，如果要选择的话，他们将必须决定采用哪种新发动机了。

At that point, they will have to decide which, if either, of these new engines they want to adopt.

youdao

在那时，如果要选择的话，他们将必须决定采用哪种新发动机了。

At that point, they will have to decide which, if either, of these new engines they want to adopt.

youdao