Mitchellite
镁铬铁矿
🗣️ 情景例句
It's not the same, Richard.
那是不一样的， Richard。
What is the total circulation of this publication.
这家刊物总发行量多少？
and if a single curved glass would distort nature, how much more would a pair of them?
何况一片曲面镜就可歪曲自然，那么伽利略的两片曲面镜对自然的歪曲又该多大呢？