If you are falling off a cliff or being chased by a madman with a knife, you feel afraid and your body secretes fear hormones.
如果你掉下悬崖或者被一个疯子拿着刀追杀，你会感觉到恐惧并且身体也会有恐惧的反应。
It was falling with the keenness of a knife-blade. Every instant the speed accelerated frightfully.
飞机下落时就像刀身锐利地划过，速度每分每秒都在急剧增加。
It was falling with the keenness of a knife-blade. Every instant the speed accelerated frightfully.
飞机下落时就像刀身锐利地划过，速度每分每秒都在急剧增加。
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