名词
中文翻译：保留量
同义词：
['retained volume', 'retained amount例句：1. The retention volume of the reservoir has decreased significantly.（水库的留存量已经显著减少。）']
例句：
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1. The retention volume of the reservoir has decreased significantly.
水库的留存量已经显著减少。
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2. The company's retention volume is expected to increase in the coming year.
预计公司留存量在来年将增加。
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3.The government needs to maintain a certain level of retention volume to ensure the stability of the economy.
政府需要保持一定的留存量水平，以确保经济的稳定。