我也已听说过在行星表面之下迷宫穿行的地下隧道系统。

I have also heard about underground tunnel system that run in mazes under the surface of the planet.

youdao

我也已听说过在行星表面之下迷宫穿行的地下隧道系统。

I have also heard about underground tunnel system that run in mazes under the surface of the planet.

youdao