I take the train to work. It is not a pleasant ride because the train can be full of people. It is so crowded that we are packed like sardines -- just like small fish in a can.

我乘火车去上班，这可不是个愉快的旅程，因为火车上满是人，乘客拥挤不堪，就像罐头里的沙丁鱼 （packed like sardines）。

I take the train to work. It is not a pleasant ride because the train can be full of people. It is so crowded that we are packed like sardines – just like small fish in a can.

我乘火车去上班，这可不是个愉快的旅程，因为火车上满是人。火车上的人挤得像沙丁鱼(packed like sardines)，就像罐子里的小鱼。