The amount of sleep that each person needs varies.
出自-2014年6月听力原文
The sleep a person needs varies from day to day
出自-2014年6月听力原文
Even if they could, Simpli Safe claims that its system is always evolving, and that it varies slightly from system to system, which means there wouldn't be a universal magic formula for cracking it.
2016年12月四级真题（第一套）阅读 Section B
Everybody sleeps, but what people stay up late to catch—or wake up early in order not to miss—varies by culture.
2015年12月四级真题（第三套）阅读 Section C
No one has a good answer" as to why fertility varies among countries, says sociologist Andrew Cherl in of The Johns Hopkins University.
出自-2013年12月阅读原文
This varies dramatically depending on crop, from three calories for plant crops to 35 calories in the production of beef
出自-2013年12月阅读原文
Even within the tropics, language diversity varies widely.
2018年12月六级真题（第一套）听力 Section C
Ocean colour varies from green to blue, depending on the type and concentration of phytoplankton.
2019年高考英语北京卷 阅读理解 阅读D 原文
The cost of adaptation varies with time.
2017年高考英语江苏卷 阅读理解 阅读D 选项
The meaning of silence varies among cultural groups.
2016年高考英语全国卷1 阅读理解 阅读D 原文