1.Depend upon it, my dear, that when there are twenty I will visit them all

【难句解析】Depend upon it在这里相当于you can depend upon it，意思是“放心吧”， twenty后省略了such young men。

【句子翻译】放心吧，我的好太太，等到有了二十个，我一定去一个个拜望到。

2.Mr. Bennet was so odd a mixture of quick parts, sarcastic humour, reserve, and caprice, that the experience of three and twenty years had been insufficient to make his wife understand his character.

【难句解析】这句话的主干是so...that...，the experience of three and twenty years是指他的妻子与他生活二十三年的经验。

【句子翻译】班纳特先生真是个古怪人，他一方面喜欢插科打浑，爱挖苦人，同时又不拘言笑，变幻莫测，真使他那位太太积二十三年之经验，还摸不透他的性格。