◣
subway ['s^bweɪ]
under ['^ndər] +ground[graund]
↑
↑
↑
↑ rail[reɪl]+way
↑ ['reɪlweɪ]
['^ndəgraund] ↑
1n.(underground railway) 地铁[英 = underground]
under+pass
↑
['^ndəpɒːs]
2n.(underpass) 地下通道[美 = underpass]
subway ['s^bweɪ]→✔under→ground→grind的过去式和过去词→underground→✔rail→way→railway✔
under→pass→underpass✔◢