烯空气跟空气十分近似.Olefin gas closely approximates air.所有的主要难点都涌现在烯酮 ( 1 ) 的合成中.All the chief difficulties crop up in the synthesis of the enone ( 1 ).某碳氢化合物已知可能是烯烃或是烷烃.A hydrocarbon was known to be either an alkene or alkane....
Acute appendicitis usually develops without relation to the ingestion of food.急性阑尾炎的发生通常与饮食无关.Cysts should be excised and sterilized to avoid ingestion by the definitive host.应该切除包囊并予以销毁,以防止被最终宿主食入.Septicemic listeriosis...
The Confederate States perceive that they cannot carry all before them with a rush.南部邦联可以看出,他们不可能突然一下子大获全胜.The thief was arrested, but his confederate escaped.小偷被逮住了，但他的同伙却逃之夭夭。The Confederate dead and wounded at New Hop...
Many of the city's populace travel to work by subway or bus.许多城市的平民都是坐地铁或公共汽车上下班.But the old man quietly faced the menacing populace.只见老人面对着杀气腾腾的群众,神色从容.The populace at large is / are opposed to sudden change.人民群众普遍...