Spiroheptane
螺[3.3.]庚烷
🗣️ 情景例句
An apple a day keeps the doctor away.
每天一个苹果不用看医生。
It is my pleasure to introduce the keynote speaker for today.
我很荣幸地介绍今天的主讲人。
This ability was first noticed by her father.
是她父亲首先发现她这一功能的。