被动含义compared to （被）与…相比
Bride is often compared to half open blossom .
新娘子通常被比作即将盛开的花朵.
Compared to investing ,savings also means avoiding risk .
与投资相比,储蓄也意味着规避风险.
主动含义：comparing ...to...
Your parents enjoy comparing you to their friends' kids你父母喜欢把你和他们朋友的小孩作比较.
这两个短语一般情况下compared to中compared后没有宾语；而comparing to中的comparing后一般加上宾语.
但是comparing to应该说是也存在的吧,因为这里的comparing也可以作不及物动词.
Comparing to last term,she has made great progress this term.
和上学期比起来,她这学期已经取得了很大的进步.