Polyiron
多晶形铁, 树脂羰基铁粉
🗣️ 情景例句
Robbie Stewart.
Robbie Stewart。
Easier said than done.
说时容易做时难。
so they are often tempted to finish a job before setting out to keep an appointment.
因此他们常想做完一件事后再去赴约。