区别就是两者意思是不一样，具体的不同如下
onthesubway中文意思是乘坐地铁
Some people support the rules that all passengers except babies and people with certain health problems are not allowed to eat or drink on the subway.
inthesubway中文意思是在地铁里
If you visit France today, it is not a surprise to meet street artists in the city or come across a singer in the subway.
