Definition: a passage under a road or railway for people to walk through Level: B2
我们可以使用地下通道安全地过马路。
We could use the ___subway to cross the road safely.
我开始沿着那条狭窄黑暗的地下通道行走。
I began to walk along that narrow and dark ___subway.
这条地下通道为行人提供了在高速公路下的安全通道。
The ___subway provides a safe passage for pedestrians under the highway.
