A teacher must have a healthy body, the skills of a farmer, the mind of a scientist, the interest in art, and the spirit of social reform.

The family is the nucleus of civilization.

技术冲击是经济波动的主要来源。

The more you look, the more you see.

It is error only, and not truth, that shrinks from inquiry.

成功不在于完美，而在于持续改进和适应变化。