18、Bite the hand that feeds one.
恩将仇报。
19、Bitter pills may have wholesome effects.
良药苦口利于病。
20、Blind men can judge no colours.
不宜问道於盲。
21、The wealth of the mind is the only wealth.
精神的财富是唯一的财富。
22、You can't judge a tree by its bark.
人不可貌相。
23、Clothes do not make the man.
人不在衣装。
24、To be both a speaker of words and a doer of deeds.
既当演说家，又做实干家。
25、Variety is the spice of life.
变化是生活的调味品。
26、Bad times make a good man.
艰难困苦出能人。
27、There is no royal road to learning.
求知无坦途。
28、Doubt is the key to knowledge.
怀疑是知识的钥匙。
29、Sharp tools make good work.
工欲善其事，必先利其器。
30、Wasting time is robbing oneself.
浪费时间就是掠夺自己。