A tunnel is a long passage which has been made under the ground, usually through a hill or under the sea.
例句
...two new railway tunnels through the Alps.穿過阿爾卑斯山的兩條新的鐵路隧道…the motorway tunnels under the Hudson river.哈得孫河下的高速公路隧道
VERB
挖隧道;挖地道
To tunnel somewhere means to make a tunnel there.
例句
The rebels tunnelled out of a maximum security jail...叛亂者挖地道逃離了戒備最為森嚴的監(jiān)獄。The caterpillars tunnel into the fruit to grow and mature.毛蟲鉆入果實，并在其中生長為成蟲。