Phenanthrone
[化] 菲酮
🗣️ 情景例句
Nurse Baker, would you come in, please?
Baker护士 请你过来一下，好吗？
Would you please hold the door open for me?
可以请你为我把门拉着吗？
and a period (which is the time it takes a wave crest to travel one wave length).
和周期（浪峰走过一个波长所需的时间）。