这也可以解释为什么心脏病和中风的死亡率在周一早晨趋向顶点,因为在周一心脏病发病率比一周中的其他日子高出了20%
stroke中风
原句中explain...宾语从句,由why引导
在宾从中,deaths是主语,from heart attacks and strokes对deaths起修饰限定的作用,相当于deaths的定语,tend to为谓语动词
as引导了原因状语从句
strokes tend to peak
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peak-to-background ratio
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