名词
中文翻译：投资率
同义词：
['return on investment', 'return on capital employed', "net profit margin例句：1. The company's investment rate has increased significantly since the new policy was implemented.（自新政策实施以来，公司的投资回报率显著提高。）"]
例句：
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1. The company's investment rate has increased significantly since the new policy was implemented.
自新政策实施以来，公司的投资回报率显著提高。
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2.The return on investment for this project is expected to be around 30%.
预计这个项目的投资回报率约为30%。
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3. The net profit margin of the company has been declining due to rising costs and competition.
由于成本上升和竞争加剧，公司的净利润率一直在下降。