compare.with.../compare with/compare...to...

1.compare ...with...有时相当于compare ...and...当涉及考察两个相象的事物以辨别他们的相似或差别时,它取with ：
The police compared the forged signature with the original.
警察将伪造的签名与原来的作比较.
You should only compare like with like.
只应在同类事物中作比较.
This one cannot compare with that one.
这个与那个无比较.
Walking can't compare with flying.
走路比不上飞
2.当它涉及描述不同事物相似性的活动时,Compare 常用介词 to ：
He compared her to a summer day.
他将她比为夏天.
Scientists sometimes compare the human brain to a computer.
科学家有时将人脑比作电脑