When your exhaust falls off, you have to replace it.如果你的排气管脱落，应将其更换。There are many sources of air pollution; exhaust fumes, for example.空气污染有许多来源, 例如废气。the exhaust fumes that are polluting our cities污染我们城市的废气Exhaust fume...
We bearrived scientists and tested concoctions of milk, orange juice, and mouthwash.咱们是科技家,尝试牛奶 、 橙汁和漱口水的混合物.We became scientists and tested concoctions of milk, orange juice, and mouthwash.我们是科学家,尝试牛奶 、 橙汁和漱口水的混合物.Liqui...