Many fresh foods are packaged in clear vacuum-formed polystyrene trays, owing to the high gas permeability and good water-vapour transmission of the material.
发动机在工作过程中,正常燃烧生成物的主要成分是二氧化碳和少量的水蒸气。
During the operation of the engine, the main components of normal combustion products should be carbon dioxide and a small amount of water vapor.
数据分析的结果显示,彗星每秒都会释放出300千克的水蒸气。
ESA Astronomers estimate that the comet is ejecting 300 kg of water vapor every second.
考虑到人口的增长,仅供暖房所排放的水蒸气量也急剧增加。
Given increasing population, the amount of water vapour emitted just by heating houses has also increased dramatically.
这里是一些事实:超过95%的温室效应来自于地球大气层的水蒸气。
Over 95 percent of the greenhouse effect is the result of water vapor in Earth's atmosphere.
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