马歇尔现年93岁，自从1973年美国国防部净评估办公室(ONA)创立便受其领导直至今年1月2日退休。
Mr Marshall, now 93, headed the Office of Net Assessment (ONA), known as the Pentagon's internal think-tank, from its creation in 1973 to his retirement on January 2nd.
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。
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.
本文针对项目评估中的净现值(NPV)和内部收益率(IRR)开展分析讨论。
This thesis is concerning Net Present Value (NPV) and Internal Rate of Return (IRR) of project evaluations.
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