'covariance'这个词语来源于英语，中文翻译为“协方差”。它是用来衡量两个变量之间的关系的统计学指标。当两个变量的协方差为正时，它们的变化趋势是相同的；当协方差为负时，它们的变化趋势是相反的；当协方差为零时，它们之间没有线性关系。
以下是9个含有'covariance'这个词语的例句：
1. The covariance between the stock price and earnings is an important factor in determining the company's valuation. （股价和收益的协方差是确定公司估值的重要因素。）
2. The researchers found that there was a high covariance between education level and income. （研究者发现教育水平和收入之间存在高度协方差。）
3. The covariance matrix is used to determine the strength of the relationships between multiple variables. （协方差矩阵用于确定多个变量之间的关系强度。）
4. The covariance of the data shows that there is a strong correlation between the two variables. （数据的协方差表明两个变量之间存在强烈的相关性。）
5. The covariance between rainfall and crop yields is an important factor in predicting agricultural productivity. （降雨量和农作物产量之间的协方差是预测农业生产力的重要因素。）
6. The positive covariance between sales and marketing expenditures indicates that an increase in marketing spending leads to higher sales. （销售和市场支出之间的正协方差表明增加市场支出会导致销售额增加。）
7. The covariance between interest rates and bond prices is an important factor in bond portfolio management. （利率和债券价格之间的协方差是债券投资组合管理的重要因素。）
8. The negative covariance between stock prices and interest rates indicates that rising interest rates can lead to lower stock prices. （股价和利率之间的负协方差表明利率上升可能导致股价下跌。）
9. The covariance of the data set was analyzed to determine the strength of the relationship between the two variables. （分析数据集的协方差以确定两个变量之间的关系强度。）
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