Cars cause pollution, both smog and acid rain.汽车造成的污染既有烟雾也有酸雨。attempts to reduce smog caused by traffic fumes旨在降低车辆尾气造成的烟雾的措施The sky over the city was overspread with a heavy smog.城市上空罩上了一层烟雾....
FOUR NEW RECORDS OF CULICOIDES FROM CHINA ( DIPTERA: CERATOPOGONIDAE )我国库蠓四新记录 ( 双翅目: 蠓科 )THREE NEW SPECIES OF LASIOHELEA FROM MINJIANG RIVER BASIN, SICHUAN ( DIPTERA: CERATOPOGONIDAE )岷江流域蠛蠓三新种 ( 双翅目: 蠓科 )TWO NEW SPECIE...