Hydrozing
(防止表面氧化的)氢气(圈内)热处理, 氢气保护热处理
🗣️ 情景例句
I must have see you somewhere before.
我一定在哪里见过你。
The man mines coal where day seems like night.
这个人在即便是白天也犹如晚上的地方开采煤炭。
I didn't know she could swim. Who taught her?
我不知道她会游泳。谁教她的？