When a smoker quits, the body quickly starts to clean itself by coughing up the debris in the respiratory system that restricts breathing.

吸烟者戒烟后，身体迅速开始清理自己，咳出在呼吸系统中影响呼吸的残留物。

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Particles less than 10 micrometers in diameter (PM10) pose a health concern because they can be inhaled into and accumulate in the respiratory system.

PM10是指大气中直径小于10微米的颗粒物，称为可吸入颗粒物，由于其可进入呼吸系统并聚集，对人体健康有一定隐患。

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Particles less than 10 micrometers in diameter (PM10) pose a health concern because they can be inhaled into and accumulate in the respiratory system.

当微粒小于10微米的直径时，就会被通过呼吸，吸进人体和积聚在人的呼吸系统，从而影响人体的健康。

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So, they don't start killing all the cells in your respiratory system; they only kill the cells that are harboring the virus.

所以它们不会杀死所有呼吸系统内的细胞,只杀死那些被病毒感染的细胞

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In fact, a real powerful virus would skip the respiratory system altogether, even better than a cold virus.

事实上，真正强有力的病毒,会跳过呼吸系统，比感冒病毒好的多。

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The respiratory system plays an important role in maintaining our internal environment at the proper level of oxygen, by bringing the right amount in.

呼吸系统的重要性在于,通过向体内输入适量的氧气,维持人体内环境中的氧平衡

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