recycling is to be recommended both economically and environmentally.老师这里是both作副词修饰副词economically and environmentally吗,还是both和and作连词连接两个副词,那both和and连接的是什么状语呢?
In 1984 , an economics professor willian lazonick joined the faculty at Harvard Bussiness School , just in time to witness a shift in economic thought .问:句中红色两个介词能否均换成of , 能说明下原因吧?