As a study aid, it is convenient, inexpensive and allknowing.

作为一个学习工具，字典非常方便、便宜而且知识全面。

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I will put a copy of the worksheet in the downloads section in case any of the students have misplaced it, and also because it will be a good study aid for the upcoming test.

我把作业纸放到了下载区，如果有找不到作业纸或者弄丢的同学可以到那再下载。因为本单元即将要考试的内容会与作业纸上的内容相似，请大家一定好好复习。

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A government study recommended a national highway system of 33,920 miles, and Congress passed the Federal-Aid Highway Act of 1944, which called for strict, centrally-controlled design criteria.

一项政府研究建议建设一个33,920英里的全国公路系统，国会通过了1944年的《联邦援助公路法案》，该法案要求制定严格的、集中管控的设计标准。

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To start with, study the rules governing college aid.

FORBES: Save For Retirement Now, Get More College Aid Later

The study was also the first to find AID in stem cells, suggesting it plays a role in the early stages of development.

BBC: NEWS | Health | Poor cell memory is key to cancer

Kaplan (Arizona State University), Kelly Richmond Pope (DePaul University), and Janet A. Samuels (Arizona State University), spearheaded a study that investigated how an unsuccessful confrontation can aid an organization in uncovering fraud.

FORBES: Don't Ask/Don't Tell About Corporate Fraud: The Effect of Confrontation On Intentions to Report Fraud by Kelly Richmond Pope, Ph.D., CPA, Peter Milan and Anya Hostetler