Polyiron
多晶形铁, 树脂羰基铁粉
🗣️ 情景例句
You've really been keeping an eye on quality.
你们的确在质量上下了功夫!
How could you do this?
怎么可以这样？
I stopped to let the car cool off and to study the map.
我停下车，让汽车发动机冷却一下，同时查看一下地图。