Tiny harmful things called germs are always trying to invade your body.

一种叫做细菌的细小生物始终在设法侵入你的身体。

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When you breathe in air through your nose, it contains lots of tiny things, like dust, dirt, germs, and pollen.

当我们平时用鼻子呼吸的时候，会吸入空气中的很多杂质，比如灰尘、尘土、细菌、花粉等。

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When you breathe in air through your nose, it contains lots of tiny things, like dust, dirt, germs, and pollen.

当我们平时用鼻子呼吸的时候，会吸入空气中的很多杂质，比如灰尘、尘土、细菌、花粉等。

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