Pentadecanolide
[建] 十五酸内酯
🗣️ 情景例句
Have you ever done supervisory work?
你担任过管理工作吗？
He who has not tasted bitter knows not what sweet is.
不吃苦中苦，哪知甜中甜。
Before you leave the lab, make sure the electricity is turned off and the windows are shut.
你们离开实验室前，务必要关上电源，关好窗户。