They can take harmful gas from the air.
它们能带走空气中的有害气体。
Trees are natural air conditioners. They take harmful gas from the air, and release oxygen into the air.
树木是天然的空气净化器，他们可以吸收空气中有害的气体并向空气中释放氧气。
Trees are natural air conditioners. They take harmful gas from the air, and release oxygen into the air.
树木是天然的空气净化器，他们可以吸收空气中有害的气体并向空气中释放氧气。
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