Check air pollution conditions several times a day.
一天能查上好几次空气污染情况。
Before you go outside to play always check the pollution index.
那你在出去玩之前，一定要经常检查空气污染指数。
Check your car to see if the pollution-control device is working.
检查一下你的车，看看防污染装置是否运转正常。
Check your car to see if the pollution-control device is working.
检查一下你的车，看看防污染装置是否运转正常。
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