Project:Sandbox

Explication

 * part of someone’s body, it is not like any other part
 * it is very thin (m)
 * when people see many parts of someone’s body, they can’t not see this part in many places
 * when something touches this someone’s body somewhere, it touches this part
 * if something bad happens to this part of someone’s body in one place, sometimes people can see blood (m) in this place