371. He should be prepared to make sacrifices to study his chosen field in depth. He should have an ambition to make some meaningful contribution to man's knowledge.

英语四级译文:
他应该准备好为深入研习自己选中的知识领域而做出牺牲。他应该有为人类知识做出一些有意义的贡献的抱负。

四级词汇讲解:
be prepared to do sth.意为“愿意做某事”。如:
I'm not prepared to accept your conditions.我不愿意接受你的条件。

make sacrifices意为“做出牺牲”。如:
His parents made sacrifices so that he could have a good education.为了让他接受良好的教育，他的父母做出了不少牺牲。

in depth意为“全面，深入，详细”。如:
You should look at the report in depth.你应该仔细看看这份报告。

ambition意为“志向，野心，雄心”。如:
She is intelligent but suffers from a lack of ambition.她很聪明，但却缺乏远大志向。

make a contribution to此处意为“为……作贡献”。如:
He made a positive contribution to the project. 他对项目做出了积极的贡献。

英语四级考点归纳:
contribution除表示“贡献”外，还有以下含义:

※ “捐款，捐资”。如:
They are asking for contributions to disaster relief.他们在为赈灾募捐。

※ “定期缴款”。如:
You can increase your monthly contributions to the pension scheme.你可以增加每月养老金计划的缴费金额。

※ “投送的稿件”。如:
This month's issue has contributions from several famous writers.这期月刊有几位著名作家的稿件。

※ “捐助”。如:
They rely entirely on voluntary contribution.他们全靠自愿捐助。