The US aviation regulator has issued a lengthy defence of its safety procedures as criticism mounts over the way in which it certified Boeing’s 737 Max aircraft, the model that has crashed twice in the last six months.
隨著各方對波音(Boeing) 737 Max機型的認證方式提出越來越多的批評，美國航空監管機構對其安全程序進行了冗長的辯護；過去6個月里，此型飛機發生了兩起墜機事故。
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