有区别,请参考下面的例子： 1、in  the  snow和on  the  snow  He  squashed  home  on  the  snow  ground. 他咯吱咯吱地踏着雪走回了家. They  discovered  suspicious  footprints  in  the  snow. 他们在雪地上发现了可疑的足迹. 2、in  the  grass和on  the  grass  Sally  saw  a  snake  in  the  grass. 莎丽在草丛中看见一条蛇. Better  not  walk  on  the  grass. 最好不要在草地上行走.
in the snow还是on the snow,in the grass还是on the grass