Even in small companies, computers are an essential tool.

即使在小公司里，计算机也是必不可少的工具。

《牛津词典》

Cultivating drawing talent can become an essential tool to improve people's observational skills in fields where the visual is important.

在强调视觉重要性的领域，培养绘画才能可以成为提高人们观察能力的重要工具。

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We chose surgical masks as an essential tool for that.

我们选择把医用口罩作为这样做的一个必要工具。

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Networking is often touted as an essential tool for building your career and business.

FORBES: Connect

Sure, I use a computer as the essential tool for making my daily bread and butter.

FORBES: Is Windows 8 Going To Kill Microsoft?

Use them now as the essential tool they are to re-establish business and build the foundations of recovery.

ECONOMIST: Bush fire