大气是若干种气体按一定比例混合而成。
The atmosphere consists of certain gases mixed together in definite proportions.
按一定比例把自己的收入奉献给神。一贯坚持。
Do give a certain percentage of your pay to God. Please be consistent.
必须保证活动扶手在各舱位等级中按一定比例分布。
You must ensure that these movable aisle armrests are provided proportionately in all classes of service in the cabin.
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