乘客在英语中被称为 "passenger"。这个词来源于拉丁语 "passus"，意思是 "走过，通过"。例如：

There were too many passengers on the bus. (公共汽车上的乘客太多了。)

The airline allows each passenger to bring one carry-on bag. (航空公司允许每名乘客携带一个手提行李。)

The passenger on the train was reading a book. (火车上的乘客正在看书。)