Piperazinedione
[化] 哌嗪二酮
??? 情景例句
He was killed on the spot.
他當(dāng)場被殺。
We don't have an extension.
我們沒有分機(jī)。
I find young people exciting.They have an air of freedom,
我覺得年輕人令人振奮，無拘無束。