It is well known to everyone that air and water are very important to men.
众所周知，空气和水对人类非常重要。
It is well known to everyone that we human beings have a common ancestor.
众所周知，我们人类有一个共同的祖先。
It is well known to everyone that the earth turns around the sun.
众所周知，地球绕着太阳转。