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1·It serves a double purpose.

这有双重的目的、作用。

2·This machine serves a double purpose.

这部机器有双重用途。

3·They hoped that it would serve a double purpose.

他们希望这能起双重作用。

4·Education has a double purpose, it is a combination involving teaching and educating people.

教育的目的是双重的，是教书与育人的统一体。

5·The invention relates to an improved double purpose brush, comprising a rod, the two ends thereof respectively being frontend and backend;

本发明涉及一种改良的双用刷，包含：一杆体，其两端分别为前 端部及后端部；

6·The double purpose, both the clinical diagnostics learning and medical English learning, is anticipated to be achieved via such bilingual teaching, mainly English teaching.

诊断学双语教学主要是采用英语进行诊断学专业教学的形式，同时达到诊断学专业和专业英语学习的双重目的。

7·Certainly, all three operators-the single, double, and back quotation marks-serve a valid purpose, but like exceptions in English, memorizing and mastering the variations can be maddening.

当然，这三种操作符(单引号、双引号和反撇号)都有合法的用途，但是与英语中的例外一样，记住和掌握这些细微差异很令人头疼。

8·If you allow the mean-spirited opinions of others to make you waver in your purpose, you incur a double shame.

如果你让别人的那些不怀好意的意见动摇你的目标，你就招致双倍的耻辱。

9·Purpose: To study clinical importance of double contrast CT arthrography in the diagnosis of shoulder instability.

目的：探讨CT空气-碘水双对比造影对诊断肩关节不稳定的临床意义。

10·Purpose: To expound necessity and possibility and discuss methods and effects of double language teaching.

目的阐述双语教学的必要性和可行性，探讨双语教学的方法和效果。