Invert， always invert: Turn a situation or problem upside down. Look at it backward.
反过来，始终反过来：把情况或问题颠倒过来，从反面看。
The beauty of mathematics is that it is both an art and a science.
作家的职责是说出真相，即使这让人感到不适。
当你有一个好收成时，农民高兴，他的妻子高兴，孩子们高兴，动物们高兴，土地也高兴。