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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带活动扶手的座位（如果有的话）的位置（如，第几排座位数）；

The specific location of seats, if any, with movable armrests (i. e. , by row and seat number);

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对FAA安全规定限制有移动障碍旅客使用的座位，不要求提供活动扶手。

You are not required to provide movable armrests on aisle seats of rows which a passenger with a mobility impairment is precluded from using by an FAA safety rule.

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