特别地，可以用这个，来检验两个向量是否相互垂直。
And, in particular, we can use this to detect when two vectors are perpendicular.
只有把CI与假设检验结合、相互补充，才能作出完整的分析结论。
Only combination of CI and hypothesis testing can give a complete analysis.
只有把CI与假设检验结合、相互补充，才能作出完整的分析结论。
Only combination of CI and hypothesis testing can give a complete analysis.
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