门窗框架在安装前都会预先喷漆，这样可以防止后期出现色差。

The window and door frames are ___pre-painted before installation to prevent color mismatch later.

在涂主色之前，我们需要先用底漆预处理这些木门。

We need to ___pre-paint these wooden doors with primer before applying the main color.