在混合的过程中，也要加入空气。
During the mixing process, air is also introduced into the mix.
混合后的冰淇淋在冷冻成型过程中会加入空气。
Ice cream mixtures have air pumped into them as they freeze.
如果你的爱车引擎有杂音而且在燃烧汽油时加入空气更加费劲时，它并不会向你抱怨什么。
If your engine's wheezing and has to work harder bringing in the air it needs to burn fuel efficiently, it doesn't complain to you.
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