below ground

1.They built a bomb shelter below ground.

他们在地下修建了一个防空洞。

2.Their missile silos are below ground.

他们导弹发射井在地下。

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

在地下面，用非常退化叶片，有或没有块或状。