这个城市是1949年解放的.The city was liberated in 1949.他们胜利地开进了被他们解放的城市。They made a triumphal march into their liberated city.我的家乡是一九四九年春解放的.My home town was liberated in the spring of 1949....
She was dancing while someone substituted at the piano.她在跳舞,别人代她弹钢琴.The synthesis methods of melatonin, related tryptaminetryptamine derivatives and substituted indoles are discussed.从人工合成的角度综述了美乐托宁及有关化合物色胺、色胺衍生物及吲哚衍生物的制...