As temperatures rise, air conditioning and popular.

随着气温的上升，空调也畅销了。

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After a while, they've got air conditioning and flush toilets and escalators, and the engineer is a pretty popular guy.

过了一阵子，他们有了空调，冲水马桶和电动扶梯，工程师成了很受欢迎的家伙。

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The parallel-flow type condenser is a new type of high coefficient and compact heat exchanger, being popular in the auto air-conditioning but not in the residential airconditionings.

平行流冷凝器是一种新型高效紧凑式换热器，目前主要应用于汽车空调中，但对其应用于家用空调器中的研究较少。

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Also, the test is done without air-conditioning, which reduces fuel economy, and without any popular options that add weight to vehicles, thereby making them less efficient.

FORBES: Fuel Economy Sticker Shock