以下为句子列表：
英文: Covariance analysis was used to analyze herbicide efficacy data from rapeseed experiments.
中文: 摘要采用协方差分析方法，对油菜田除草剂的试验结果进行了分析。
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英文: Then, comparisons are made by covariance analysis on each character individually by sexes and regions; and then a multiple characters comparison is made by canonical multivariate analysis.
中文: 再以正准多变值统计分析法求各个海域标本，在空间分布上所占有的相对位置，以判定异同程度。
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英文: When compared with single factor analysis of variance, covariance analysis reduced efficacy evaluation error resulting from uneven weed distribution in the field.
中文: 结果表明，与按单因素试验方差分析相比，协方差分析方法可以减小因杂草田间分布不均匀而导致的调查误差。
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