Spirostane
螺旋甾烷
🗣️ 情景例句
OK. I understand. Thank you.
好吧，我懂了，谢谢你。
It is not polite to eavesdrop on the conversation of other people.
偷听他人说话是很不礼貌的。
when a significant number of people are living permanently in space.
如果有相当数量的人永久性地住在太空，