Nitriding
v. 渗氮
🗣️ 情景例句
You were right, Grandpa.
给你说对了 ，爷爷。
God! It's a hard stuff.
唔！这家伙是个硬骨头。
but the scientific dust has long since settled,
但是，自他逝世以来，那场科学上的纷争早已平息了下来，