Polyiron
多晶形铁, 树脂羰基铁粉
🗣️ 情景例句
What is this charge here?
这是什么费用？
I guess he will say something.
我猜他会说什么。
Between 1850 and 1910 the bison population is thought to have fallen from 60 million to just a few hundred.
人们认为，在1850年到1910年之间，野牛的头数从6，000万头降到只有几百头了。