In the introduction, the thesis accounts for the purpose and background of writing briefly.

导言部分，主要介绍论文写作的目的与背景。

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Crafting a security policy requires planning ahead of time to resolve the issues on how purpose, scope, and background of the policy should be stated.

制定安全策略需要提前进行计划，解决应该如何声明策略的用途、范围和背景的问题。

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The introduction part describes the background, significance, methods, purpose and contents of the research.

引言部分介绍了论文研究的背景和意义、方法、目的和内容。

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We must remember that the same thing that defined our strength on that day should define our strength in response -- a nation that unites people from every faith, culture and background in a common purpose.

CNN: Don't scapegoat a faith for bombings

And the strongest democracies flourish from frequent and lively debate, but they endure when people of every background and belief find a way to set aside smaller differences in service of a greater purpose.

WHITEHOUSE: Presidential Press Conference

As background, the EFSF is the special purpose vehicle which is to buy the bonds of Italy, Greece and other countries so that yields do not soar and thus default can be avoided.

FORBES: Eurozone Crisis: EFSF Buys its Own Bonds