RNA interference gives researchers a new tool for understanding how living things grow--how a plant assumes a particular shape, for example, or how a baby's hand forms during gestation.

核糖核酸的干扰作用为研究人员搞清生命生长提供了一个新工具——比如说，植物是如何展现其独特外形的，婴儿的小手在母体里是如何形成的，等等。

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SaaS can be used as an operational business intelligence tool for decision makers in a manufacturing plant.

SaaS 可充当制造型工厂的决策者的经营业务智能工具。

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It is now a standard tool of plant physiologists for both field and laboratory measurements of plant water potential.

它现在是植物生理学者一个标准工具为植物水潜力的领域和实验室测量。

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Environmentalists, like John Walke of Natural Resources Defense Council, say the Bush administration is abandoning an essential tool to force those plant to clean up fast.

NPR: EPA Proposal Eases Rules on Pollution Controls