By replacing your air filter annually, or biannually if you live in a dusty area, you'll ensure the engine can breathe freely.
每年换一次过滤器或者在沙尘多的地方每半年更换一次能保证你的爱车引擎自由呼吸。
In some parts of the world the air quality is so bad people can no longer breathe freely.
世界上一些地区的空气质量相当差以至于人们都不能自由呼吸了。
Many people in the world must. In some parts of the world the air quality is so bad people can no longer breathe freely.
很多人身处这样的地方，世界上有些地方的空气质量很糟，人都无法自由呼吸。
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