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。
2
Make sure the salesperson looks at the shape and arch to figure out what type of foot (high arches or flat feet, for example) you have.
确保销售员看了脚的形状和拱，断定你的脚型是哪一种。
3
I have a higharch and narrow foot, it is necessary for me to try shoes on in the shops.