Polyiron
多晶形铁, 树脂羰基铁粉
🗣️ 情景例句
have become good friends, haven't you?
成了好朋友，不是吗？
Nothing so bad but might be a blessing.
塞翁失马，焉知非福。
many of them serious and senior scientists---- who dream of sending people to it.
其中的不少人是认真和资深的科学家，他们一直梦想着把人送上火星。