Pipecoline
2-甲基哌啶
🗣️ 情景例句
It's nice to see you again.
再次见到你，真是太好了。
Knowledge will not be aquired without pain and application.
不花力气，不下功夫是得不到知识的。
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，