it's generally believed that teaching is as much an art as it is a science.

强调的是前面teaching is an art

就好像he is as tall as you. 强调的是he is tall

就像和什么一样啊,教育就像艺术一样,是一门科学.

前边并不是强调吧
只是说是一种大众观点
后边的才是真正的句子内容