He still grew fatter (with) each day

问题描述:

He still grew fatter (with) each day
我书上是有with的,但我不知道此句中为什么要with

是表示动作的词,表示伴随]随着,和...同时
change with the temperature
随着温度而变化
increase with years
逐年增加
be up with the dawn
黎明即起