Periost
[医] 骨膜
🗣️ 情景例句
I should have asked you first.
我应该先征得你的同意。
I was on the track team 10 years ago.
十年前，我在田径队。
The comparable speed from the Moon is only 1.5 miles per second.
而从月球出发的相应速度只是每秒1。5英里。