Cephamycin
头霉素
🗣️ 情景例句
He's writing to invite me
他写信邀请我
That's an exaggeration!
太夸张了！
It was not long before a helicopter arrived on the scene to rescue the survivors of the plane crash.
不久，一架直升飞机飞抵飞机失事现场，来搭救这几个幸存者。