They coupled two railway coaches.是什么意思？

They coupled two railway coaches.

他们把两节火车车厢连接起来。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

coupled

adj. 连结的，联系的；

例句
...a problem that is coupled with lower demand for the machines themselves...
这个问题外加上对机器本身需求量的下降

two

n. 两个，两个东西，两点钟，一对；adj. 两个的，我

例句
He has been absent from his desk for two weeks...
他已经有两个星期没有坐在办公桌前了。

railway

n. 铁路，铁道，铁路系统，铁道部门；vi. 乘火车旅行，在…铺设铁路；

例句
He walked back over the railway bridge.
他从铁路桥上走了回去。

coaches

n. 长途客运汽车( coach的名词复数 )，（铁路）旅客车厢，教练，指

例句
Commercial vehicles, coaches and lorries are required by law to be fitted with tachographs.
法律规定商用车辆、长途汽车和卡车要安装转速计。