以…为…yǐ… wéi…

拿…当作…：你们自己以假为真，何苦来烧我！ (十二·266)日间以习射为由，请了各世家弟兄及诸富贵亲友来较射。(七五·1845)读书人不在黄道黑道，总以事理为要。(一·19)

以…为…

take…as…；regard…as…
以上海浦东开发区为龙头，进一步开放长江沿岸城市open more cities along the Yangtze River with the Pudong Area of Shanghai playing the leading role/以博彩业为龙头the leading role of gaming industry