insinuatingly

adverb [方式副词]谄媚地；奉承地

The art book has art to sell, insinuatingly, and for a purpose, like the American Muse, which has in fact a tradition to sell, and one which doesn't exist, in painting.
这本艺术类图书是在巧妙地推销艺术，其目的就是为了推销像美国艺术那样实际上在油画中并不存在的艺术传统。