Phenanthrone
[化] 菲酮
🗣️ 情景例句
What's your mother's occupation?
你妈妈的职业是什么？
An hour in the morning is worth two in the evening.
一日之计在于晨。
So was born the echo-sounding apparatus, now in general use in ships.
这样就产生了目前各种船舶上普遍应用的回声探测仪。