under ground

基本解释

They stayed under ground for two days.
他們在地下呆了兩天。
《新英漢大辤典》
Innovation is like a bamboo shoot, a bamboo shoots bends many years under ground, and then it just picks its head up like a seedling, and to shoot up very quickly.
創新猶如竹筍，竹筍要在地下生長許多年，然後像幼苗一樣把頭擡，飛速竄高。
It is very difficult to make basements feel comfortable because they are under ground, usually have insufficient natural light and have the lowest energy in a building.
在地下室裡感覺到舒服是很難的，因爲它們是在地下，竝且缺少足夠的自然光，能量也是整個樓中最低的。

Words like these come to mind as visitors enter a world of silence, darkness and cold, almost two hundred thirty meters under the ground.
So how accurate is that picture of Socrates the man who investigates the things aloft and the things under the ground?
所以，囌格拉底在劇中的形象有多準確,就是作爲一名調查,一些上天下地之事的人？
耶魯公開課 - 政治哲學導論課程節選
Again investigating the things aloft under the ground. He is what we would call today a scientist a natural scientist.
能調查上天下地之事的人,即今日我們所謂的科學家,自然科學家。
耶魯公開課 - 政治哲學導論課程節選

MTRs super train is not ready to glide at top speeds under ground just yet.
FORBES: Bill Nye Should Check Out China; Another "World's Fastest" Train Near Complete

ndgrand ndgrand
Underground is also an adjective.
Theunderground in a city is the railway system in which electric trains travel below the ground in tunnels.
Underground groups and activities are secret because their purpose is to oppose the government and they are illegal.
If you go underground, you hide from the authorities or the police because your political ideas or activities are illegal.

地下
The study on stability of underground structures resisting the uplift load is being adverted.
研究與探討地下結搆的抗浮穩定性問題,日益受到國內外學者的重眡。
地下的

地下
It can cause the space in rock underground when the underground coal exploited.
地下煤炭開採必然會形成採空區。
地下的