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http://ling-lingchinese.com/2018/05/13/%e4%b8%8d%e4%bd%86%e3%80%82%e3%80%82%e3%80%82%e8%80%8c%e4%b8%94-not-only-but-also-budan-erqie/
不但。。。而且 Not only...but also... (budan...erqie...)