回火蓝色，缎面或抛光的钢件，但不能刻。

Steel parts are tempered blue, satin or polished, but not engraved.

youdao

回火蓝色，缎面或抛光的钢件，但不能刻。

Steel parts are tempered blue, satin or polished, but not engraved.

youdao