The test consists of placing the bottom of a foot in water, then stepping on a paper bag or some other object that will show how high or flat a person's arch is.
测试要先把脚底浸湿，然后踩在纸袋或其它可以显示你足弓高度的物体上。
Its door was open, and stepping into black darkness he fell headlong over some heavy object on the floor.
房门开着，因为太黑，他进去的时候绊到了重物头向下摔倒。
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