This tool is used to test the null hypothesis that there is no difference between two population means against either one-sided or two-sided alternative hypotheses.

此工具用于检验两个总体平均值之间不存在差异的空值假设，而不是单方或双方的其他假设。

youdao

Cole, from the back, and Rooney, filling out, provided the alternative flexibility when Gerrard moved from his left-sided position.

科尔从左路助攻而上，而鲁尼则适时的灵活的回撤，当杰拉德从左路助攻而上。

youdao

He noted that in past negotiations, Syria has sided with Iran, Hezbollah and Hamas in arguing an alternative "narrative" that a broader Middle East peace initiative would not have to include a Palestinian state.

CNN: Analysis: Small steps a way to broader Mideast peace?