Ferroselenium
硒铁
🗣️ 情景例句
about leaving New York, the family, and friends.
对于离开纽约， 家人和朋友。
What would you have done last night if you hadn't had to study?
如果昨晚你不必学习你会做什么？
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？