Colorless green ideas sleep furiously.

There is no must in art because art is free.

大树恨枝干上没有树叶，不要怨怪是太阳偏心故意晒偏。

In mathematics, the art of proposing a question must be held of higher value than solving it.

每个区域都是整体的一部分，而整体反映在每个部分中。