Trees reduce dust and help keep the air clean.
树木减少灰尘，有助于保持空气清洁。
Trees help keep the air clean and they make oxygen that we can breathe.
树木有助于净化空气，释放出可供我们呼吸的氧气。
它们帮助保持空气干净。
Trees help keep the air clean.
树木有助于空气保持清新。
They are encouraged to use bicycles, which are thought to help keep the air clean.
鼓励人们使用有助空气清洁的自行车。
Offer to help your parents keep the air filters on your ac and furnace clean.
帮助父母保持空调和暖气的空气过滤器的清洁。
Offer to help your parents keep the air filters on your ac and furnace clean.
帮助父母保持空调和暖气的空气过滤器的清洁。
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