The cables are buried one metre below ground level.

电缆埋在地平面下一米深的地方。

《牛津词典》

The lowest habitable story of a building, usually below ground level.

可居住的最低的建筑物楼层，通常在地平面以下。

youdao

Note that anything above or below ground level is misaligned, such as the black cubes at the river side.

请注意，任何高于或低于地面水平对齐，如黑色立方体在河边。

youdao

One of the biggest rooms below ground level is the kitchen.

VOA: special.2009.11.16

Later,we visit rooms below ground level.

VOA: special.2009.11.16

But in the spirit of commercialism there are now plans to build a subterranean shopping complex and a huge public transit terminal from 30ft below ground level.

BBC: The battle over Ground Zero

The waste heat is converted into cooling capacity, and the small heat surplus is dumped into aquifers 300 m below ground level, where it is stored and recovered in winter.

CNN: ASIANOW - TIME Asia

It is expected to reveal the less salubrious parts of Roman London outside of the City walls with archaeologists anticipating to encounter Roman timber-framed buildings and a street surface 6m below ground level.

BBC: Crossrail dig unearths forgotten London