1、To be both a speaker of words and a doer of deeds.

既当演说家，又做实干家。

2、Variety is the spice of life.

变化是生活的调味品。

3、Bad times make a good man.

艰难困苦出能人。

4、There is no royal road to learning.

求知无坦途。

5、Doubt is the key to knowledge.

怀疑是知识的钥匙。