对电镀化学工程师来说，它是控制电镀槽最有用的工具。
It is among the most useful tools available to the plating chemist for control of plating baths.
现在对Node . js来说最有用的工具也许是Node包管理器npm。
Probably the most useful tool for Node.js right now is NPM, the node package manager.
最有用的工具之一就是Linux的发行版的Live CD，最好手头上备有。
One of the most useful tools to keep on hand is a live CD of some sort of Linux distribution.
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