Indexing reference books are the essential tools for subject indexing.

标引工具书是主题标引时必不可少的参考工具书。

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DNA chip technique is becoming one of the essential tools in this field.

基因芯片技术正成为该领域非常重要的研究工具之一。

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Rather, they are trying to focus attention on cognitive faculties that go beyond intelligence - what they describe as the essential tools of rational thinking.

他们试图关注的是智力之上的认知才能——他们把这些才能描述为理性思考的关键工具。

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In fact, feedback is one of the most essential leadership tools you can use to assure people are continually improving their skills, decision-making, attention to detail and overall performance.

FORBES: 3 Ways Feedback Serves as a Highly Effective Career Advancement Tool

The Video Training Basics project aims to equip a generation of film makers and viewers with the basic tools that are essential to use the audiovisual medium effectively in order to demonstrate the plurality of views and issues that form civil society.

UNESCO: Communication and Information

The lathe, which is essential to make many of the more complex tools on the Forbes list, is a mechanism for rotating work to be shaped with a knife.

FORBES: Magazine Article