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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Well, trees are natural air conditioners. They cool the air and clean it. Three trees can do the job of 15 air conditioners.

嗯，树木是天然的空气净化器。他们空气的温度下降，把它打扫干净。三棵树就能做这项工作15空调。

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Thanks to the natural light and ventilation, lamps and air-conditioners are not needed, which saves a lot of energy.

由于自然光和自然通风，空调和人工照明不再是必须的，节省了大量的能源。

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