Factories are no longer allowed to pollute the air with black smoke.不再允许工厂的黑烟污染空气了.These gases pollute the atmosphere of towns and cities.这些气体污染了城镇的空气。Mining would pollute the lake and denude the forest.采矿会污染湖水，毁掉森林。Bicy...
Mining would pollute the lake and denude the forest.采矿会污染湖水，毁掉森林。Factories are no longer allowed to pollute the air with black smoke.不再允许工厂的黑烟污染空气了.She thinks these books pollute the minds of children.她认为这些书腐蚀儿童的心灵....
I was confronted with an array of knobs, levers, and switches.我面对的是一大堆旋钮、控制杆和开关。All their beds were distinctive; Mac'swas an iron affair with brass knobs.他们的床都各具特色；马克的床是张带球形黄铜柱头的铁家伙。The door knobs came off in our ha...