A mind map is basically a tool that connects information around a central subject.

思维导图是一种基本工具，它将信息与中心主题连接起来。

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SMEs offer expertise in a particular tool or subject area.

科目专家提供关于特定工具和科目领域的专业知识。

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This simple search tool lets you browse by letter or subject area.

Online Medical Dictionary：通过这个简易搜索工具可以通过字母或者主题进行浏览。

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Dixon has harnessed a process known as mineral accretion a tool of bioengineering to subject the chairs to low-voltage charges of solar power that encourage the growth of limestone at something close to three times the usual rate.

WSJ: Tom Dixon Makes Things Better

But he suggested that they proved a useful tool for the Backbench Business Committee to gauge the level of support for a particular subject.

BBC: Adjournment debate

If changes currently going through parliament become law, Asbos will become a tool in criminal cases, so people convicted of crime and disorder offences can be subject to an order on top of their sentence.

BBC: Q&A: Anti-social behaviour orders