2、钟表，可以回到起点，却已不是昨天。watches and clocks, can return to the starting point, but not yesterday.
3、不问收获，但问耕耘！天道酬勤。do not ask for harvest, but ask for cultivation! heaven rewards diligence.
4、勤学精思而心明，好问多练则智深。diligent and thoughtful, inquisitive and practical is wise.