whereas /weɚˈæz/ conjunction Learner's definition of WHEREAS
1
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used to make a statement that describes how two people, groups, etc., are different但是，而（用于形容两个人、两个团体等的不同） -
Some of these species have flourished, whereas others have struggled.这些物种有的生机勃勃，而另一些却生存艰难。
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Whereas many people have supported the proposal, others have opposed it very strongly.很多人都表示支持这一提案，但还有一些人强烈反对。
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He has brown eyes whereas his children have green eyes.他的眼睛是棕色的，而他的孩子们的眼睛却是绿色的。
2
law : since it is true that鉴于 —
usually used at the beginning of a statement in an official document通常用于官方文件中陈述的起始处