Although a formal environmental impact assessment has not yet been done, it should not be assumed that thiomersal-free presentations of vaccines will yield a positive net effect on the environment.

虽然尚未开展正式的环境影响评估，但不应假设无硫柳汞的疫苗对环境产生的净效果是正面的。

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This paper compares JIT purchase way with traditional purchase way, and obtains the advantages of JIT purchases way, obtains its positive impact on company's net present value (NPV) appreciation.

本文通过分析比较JIT采购方式与传统采购方式的不同，得出JIT采购方式的优点，并得出其对公司净现值增值的积极影响。

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This is a long history of net-positive impact of government investment and risk taking in advancing new American technologies, corporations, jobs, and the wealth of our nation.

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In this case you only want immigrants who are likely to have positive net economic impact on natives.

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Imagine if these people were focused instead on having a positive impact on your Net Health rather than a negative impact on your Net Worth.

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