Pain is a defense system that indicates when something is wrong, comments Marshall Devor, a pioneer in pain research at the Hebrew University of Jerusalem.

• 以色列耶路撒冷希伯来大学的疼痛研究先驱狄佛（MarshallDevor）说，疼痛是一种防卫系统，告知我们身上哪里不对劲了。