Polyiron
多晶形铁, 树脂羰基铁粉
🗣️ 情景例句
Have you filled in the baggage declaration?
行李申请单填好了吗？
A good conscience is a soft pillow.
白日不做亏心事，夜半敲门心不惊。
Don't be so childish.
别这么孩子气。