They built a bomb shelter below ground.

他们在地下修建了一个防空洞。

Their missile silos are below ground.

他们的导弹在地下。

Stem with much reduced leaf blades that function as rhizoids below ground, with or without tubers or rhizomes.

在地下面，起假根的用的茎具非常退化叶片，有有块茎根状茎。