What if it rained and then froze all through those months?要是那几个月一直又下雨又冰冻怎么办？So what if sometimes they stayed rather late, it doesn't mean anything.因此，即便有时他们熬夜到很晚，那也说明不了什么。"What if I had said no?" "About the apartmen...
Play-ing chess is his favourite pastime.下棋是他最喜爱的消遣。The ? ing girdling process weakens the trees, it.这个带状剥树皮的过程伤害了树.Hillsden was complain-ing of cramp in his calf muscles.希尔斯登说他小腿抽筋。People here are reclaim-ing land from t...
The technique has been to mutate the genes by irradiation or chemicals.该技术是通过放射线照射或者使用化学方法使基因变异。the ability of the virus to mutate into new forms病毒变异成新菌株的能力A newer anti-HIV drug called pyridinone caused HIV to mutate int...