Within a single time zone, the time of sunset varies substantially.
在同一个时区内，日落的时间有很大差异。
Within na single time zone, the time of sunset varies substantially.
在同一个时区内，日落的时间有很大差异。
Better-educated people are healthier, but the magnitude of the relationship between health and education varies substantially across groups and over time.
一个普遍的事实是受教育程度高的人群拥有更好的健康状况。
Better-educated people are healthier, but the magnitude of the relationship between health and education varies substantially across groups and over time.
一个普遍的事实是受教育程度高的人群拥有更好的健康状况。
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