Jackmanizing
深度渗碳; 深渗碳处理
🗣️ 情景例句
I frankly don't know what to do about it.
我真不知道该怎么解决。
Don't be anxious if I'm late.
如果我回来晚些也不必担忧。
The undulating waves of the open sea are generated by three natural causes:
海浪是由三个自然因素形成的：