The arms and legs are very important to us. Therefore when asked why you are not going to buy something expensive, you may answer, "It costs an arm and a leg!" You mean that it is really expensive. If you pull one's leg, it means you make fun of someone.

18. Toe

To convey the idea "from head to foot", English people san say from top to toe. But Chinese people don't.

Some people turn their toes out (八字脚) when they walk. Some turn their toes in.

When faced with danger, we must be alert and ready for action, that is to say, we must be on our toes (保持警惕).

19. Skin

Human beings have skin. So have animals and plants. The skin can be think or thin. A think-skinned person, or a person who has a thin skin, is easily upset or offended while a thick-skinned person, or a person who has a think skin, is quite the contrary. Both expressions are sometimes derogatory (贬义). That is to say, sometimes the former refers to a person who is too sensitive; the latter a person who has little sense of shame.

20. Hair

Most people will only think of the hair on our head when the word hair is mentioned. In fact, some animals and plants also have hair.

A horrible scene may make a person's hair stand on end (毛骨悚然). But a courageous person will not turn a hair (不畏惧) even though he is in face of danger.

Sometimes, a friend of yours may be so angry that he may act foolishly. Then you had better give him this advice: "Keep your hair on (别发脾气)".

Selected from the book" The Human Body" by Huang Juanhua