... (RLHV) 垃圾低热值 regional airplane 区间客机 regressive tax 累退税率 ...
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regional airplane
地区的飞机
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Any erosion of airplane-maintenance quality is worrisome, the author says, but at regional airlines, which tend to use smaller planes that have less margin for error, the erosion is positively alarming.
WSJ: Book Review: Attention All Passengers
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