On most commercial planes, at least half of the air comes from outside the aircraft and passes through a high-efficiency particulate air, or HEPA, filter which removes contaminants
在多数商用飞机上，至少有一半空气是来自于飞机外部，而且都经过了一种高效空气净化装置的过滤。
Inside your home, use a high-efficiency particulate air (HEPA) purifier capable of removing PM2.5 particles, or install such a filter in your heating system.
在你的家里，使用能够去除PM 2.5颗粒的高效颗粒空气净化器，或在你的加热系统中安装这样一个过滤器。
On most commercial planes, at least half of the air comes from outside the aircraft and passes through a high-efficiency particulate air, or HEPA, filter which removes contaminants.
大部分的商业飞机上，至少有一半的空气来自飞机外面，并经过高…也叫HEPA，过滤装置。可以去除污染。
On most commercial planes, at least half of the air comes from outside the aircraft and passes through a high-efficiency particulate air, or HEPA, filter which removes contaminants.
大部分的商业飞机上，至少有一半的空气来自飞机外面，并经过高…也叫HEPA，过滤装置。可以去除污染。
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