它的体积明显要比通常安全气囊要小得多，因此它只需要小一罐气体——就像一小罐二氧化碳气瓶——并且不会产生热量。

Since they're much smaller, in terms of volume, than a regular airbag and use just a small canister for gas-similar to a CO2 cartridge-the belts don't get hot like airbags do.

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它的体积明显要比通常安全气囊要小得多，因此它只需要小一罐气体——就像一小罐二氧化碳气瓶——并且不会产生热量。

Since they're much smaller, in terms of volume, than a regular airbag and use just a small canister for gas--similar to a CO2 cartridge--the belts don't get hot like airbags do.

youdao

肺泡：肺内的约3亿个小气囊，于此，二氧化碳从血中排出，氧气进入血液。

Pulmonary alveolus: Any of the 300 million or so small air Spaces in the lungs where carbon dioxide leaves the blood and oxygen enters it.

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