Umbelliprenin
(=umbelliferone farnesyl ether)伞花烯片, 伞形酮金 合欢醚, 伞形花醚
🗣️ 情景例句
He's been here for years, he should know the ins and outs of the job by now.
他在这里已经好多年，现在理应熟悉各方面的工作了。
How far is it from here to the bus stop?
到公共汽车站有多远？
Because he doesn't like school!
因为他不喜欢上学。