这个词经常被native speakers用来在书面的复杂句中引导从句，与主句形成对比

The graph indicates that on average men had 52 hours of leisure per week whereas women only had approximately 39 hours.

这张图表显示平均来说，男人每周可以拥有52个小时的休闲时间， 而女人只有39个小时。

近义：while 而同时

也经常用于在复杂句中引导从句，与主句构成对比

More men than women hold qualifications at the lower and higher levels of education while more women reach undergraduate diploma level than men.

越来越多的女性拥有本科学历，而男性则更多地集中在更高或更低的学历区间中。