数字水印的主要研究目的是版权保护。

The main research aim of digital watermark is copyright protection.

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这是本文的主要研究目的。

These are main research aims of this paper.

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本文的主要研究目的是对能够预见的未来做提前准备。

The main purpose of the study is to advance the foreseeable future to prepare.

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There is a very big-- one of the largest clinical trials that the U.S. Government ever did was called the Women's Health Initiative, and there were several purposes built into this particular study, but what it did was it took post menopausal women and randomly assigned them to different dietary conditions.

有一个很大的,美国政府曾经做过的,一个最大的临床试验,叫做"妇女健康倡导计划",这项研究有几个特殊的目的,研究主要是将更年期的妇女,随机分配至,不同的饮食环境中

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选