Polyiron
多晶形铁, 树脂羰基铁粉
🗣️ 情景例句
you know,
你知道的，
Industry is fortune's right hand, and frugality her left.
勤勉是幸运的右手，节约是幸运的左手。
It has belonged to our family for a long time.
我们家有这件乐器已经很久了，