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1. The marginal efficiency of investment is a crucial factor in determining the success of a project.
投资的边际效率是决定项目成功的关键因素。
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2. The marginal efficiency of investment has been shown to be significantly higher than that of other industries.
研究表明，投资的边际效率远高于其他行业。
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3. The marginal efficiency of investment can vary greatly depending on the specific circumstances and market conditions.
投资的边际效率会根据具体情况和市场条件有很大的波动。