名词
中文翻译：线性变化
同义词：
['linear trend', 'linear growth', 'linear progression']
例句：
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1. The population growth rate has been increasing at a linear variation over the past decade.
过去十年里，人口增长率一直在以线性变化增加。
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2. The company's revenue has shown a linear variation in the last quarter.
公司上一季度的收入显示了线性变化。
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3. The study found that the temperature had a linear variation with altitude.
研究发现，温度与海拔高度之间存在线性变化关系。