If woods are to the earth is what hair is to the head,then the earth is a bald:Vehicles are now parasites,sucking up fresh blood from the earth.We human beings are now viruses sticking to the surface of the earth by a troop of several billions,proliferating,mutating,and the earth is in terrible infection now with body temperature rocketing up.

A is to B is what C is to D 是A之于B正如C之于D