你无法改变过去，但可以通过担心未来来毁掉现在。
You can't change the past, but you can ruin the present by worrying about the future.
The wild teaches you that you are capable of more than you think.
Every technological breakthrough is a challenge to the limits.
解释：不在农忙时役使百姓而耽误农时，那么可以保证百姓富裕。