To each appearance， as it arises， we should oppose the equal appearance.

If everything was perfect, you would never learn and you would never grow.

A healthy animal is the foundation of a healthy food chain.

译文：志向正直就能遏制各种坏念头，心里平静处理各种事情就不会急躁。赏析：恶念是所有错误行为的根源，我们要砥砺自己的品格，遇事冲动鲁莽，只会坏事。

Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.

建筑是关于创造内外之间的门槛。