以柳丝榆荚的从容反衬桃李的飘零，暗喻超然物外的态度

When you can't go back, you have to worry only about the best way of moving forward.

Mathematics is the language with which God has written the universe.

成为英雄的最大障碍是怀疑自己是否会证明自己是个傻瓜；真正的英雄主义是抵制这种怀疑；最深刻的智慧是知道何时应该抵制，何时应该服从。

形容曹雪芹的文笔如龙腾虎跃，气势非凡。

儿童是通过努力从事活动，从而使个人得到发展的。