we often compare life-a river a.with b.into c. to d.of

to
compare的第二种意思
VERB 动词
把…比作 If you compare one person or thing to another,you say that they are like the other person or thing.
Some commentators compared his work to that of James Joyce...有些评注者把他的作品与詹姆斯·乔伊斯的作品相提并论.
I can only compare the experience to falling in love.我只能把这段经历比作坠入爱河.