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whereas + [clause A], [clause B] (contrast)
用于对比两个相反的事实。
He is outgoing, whereas his sister is shy.
他性格外向，而他的妹妹却很害羞。
然而；但是；而
先理解核心含义，再看它在真实句子里的用法。
然而；但是；而
used to contrast two facts or ideas; while on the contrary; although
He is outgoing, whereas his sister is shy.
他性格外向，而他的妹妹却很害羞。
用于引出与前文相反或对比的情况，语气较正式。
相反地；然而；虽然。
In contrast; whilst on the contrary; although.
由于；鉴于。(常用于开头陈述；有时加粗或强调作为标识。)
It being the fact that; inasmuch as. (Often used to begin recitals; sometimes emboldened or emphasized as a signifier.)
My brother likes spicy food, whereas I prefer mild flavors.
我哥哥喜欢辣的食物，而我更喜欢清淡的口味。
The north of the country is cold and dry, whereas the south is warm and rainy.
这个国家北部寒冷干燥，而南部温暖多雨。
She works full time, whereas he only works part time.
她全职工作，而他只做兼职。
用于对比两个相反的事实。
He is outgoing, whereas his sister is shy.
他性格外向，而他的妹妹却很害羞。
Some people like summer, whereas others prefer winter.
有些人喜欢夏天，而另一些人则更喜欢冬天。
常用于正式文件或法律文本中，表示“鉴于”。
Whereas the company has failed to meet its targets, further action is required.
鉴于公司未能达到目标，需要采取进一步措施。
Not this
He didn't come to the party, whereas he was sick.
Use this
He didn't come to the party because he was sick.
“whereas”表示对比（然而），不表示原因。如果想表达原因，应该用“because”。
Not this
Whereas I like sports, whereas my brother likes music.
Use this
I like sports, whereas my brother likes music.
“whereas”是连词，只需在对比的两个分句之间使用一次，不能像“一边……一边”那样重复使用。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
然而事实上
He claimed he was innocent, whereas in fact he was guilty.
他声称自己无辜，然而事实上他有罪。
然而被告
The plaintiff argued that the contract was valid, whereas the defendant disagreed.
原告辩称合同有效，然而被告不同意。
然而之前
The company had been profitable, whereas previously it had suffered losses.
公司已经盈利，然而之前它还遭受亏损。
发短 /ɛ/ 音 (如 head, bread)
Use whereas naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
whereas = where + as，对比两种情况，表示'然而'或'鉴于'。
语域：formal 常见场景：法律文件、学术写作、正式论证 多用于正式场合，如法律文件或学术写作中，表示对比或鉴于。
用于对比两个事实，意为'然而'；或用于正式文件中引出法律条文等，意为'鉴于'。
Dictionary facts from ECDICT, WIKTIONARY.
Watch the sound change