Ethynylation
炔化, 乙炔化作用
🗣️ 情景例句
What a downpour!
下得可真够大的！
What platform does the train leave from?
这班车从哪个站台开出呢？
She left home when she was eighteen and has lived in Los Angeles for the past fifteen years.
18岁时，她离开了家。过去的15年里她一直住在洛杉矶。