A shoehorn is a shoehorn and slippers (tongue-shaped, used when wearing shoes). Put the shoehorn on the heel of the shoe, and you can put on your shoes easily and quickly by stepping on it, avoiding direct contact between your hands, which is hygienic and convenient.
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Look at the picture.
It just looks like a shoehorn ~ ~ Zhao Benshan's face looks like a shoehorn, and the side looks very curved. So he said it was a pig's waist and face.