名词
中文翻译：底线
同义词：
['limit', 'threshold']
例句：
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1.The company's bottom line is $5 million a year.
这家公司的年收入是500万美元。
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2. The project has to meet the bottom line of cost and time.
这个项目必须满足成本和时间的双重底线。
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3. The manager promised to keep the bottom line high.
经理承诺保持高利润。