If your raw material tests clean, then you're making specks somewhere in your process.

如果你的原材料是干净的，那么你就是在加工中制造了黑点。

youdao

If your raw material tests clean, then you're making specks somewhere in your process.

如果你的原材料是干净的，那么你就是在加工中制造了黑点。

youdao