waterproof:防水的(water水)
rainproof:防雨的(rain雨)
foolproof:错不了的(fool笨蛋)
airproof:不透气的(air空气)
lightproof:不透光的(light光线)
bulletproof:防弹的(bullet子弹)
gasproof:防毒气(gas气体,毒气)