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....
硅易于和卤化物化合成新的化合物.The silicon with halogenideization composes easily the new chemical compound.硷金属卤化物能生长成具有优良透明性的大晶体.The alkali halides can be grown into large crystals of excellent transparency.多卤化物的形成取决于中心卤化物离子的结合.The fo...