Dihydrosphingosine
二氢(神经)鞘氨醇
🗣️ 情景例句
Be our guest.
请随意。
What may be done at any time will be done at no time.
在任何时候都可做的事情，总是在任何时候都不做的事情。
The most unusual car was a Benz which had only three wheels.
而最不寻常的一辆则要属只有3只轮子的奔驰牌汽车了。