"Once well underground," he said, "you know exactly where you are."
“一旦到了地下，”他说，“你就知道自己在哪儿了。”
Once these plants use up their stored reserve or tap out the underground supply, they cease growing and start to die.
一旦这些植物耗尽它们储存的水或者用完地下水源，它们就会停止生长并开始死亡。
Once, people used too much underground water.
过去，人们使用了太多的地下水。
Once all this information has been gathered, it becomes possible to judge whether a lake's flow is mainly due to its surface inputs and outputs or to its underground inputs and outputs.
一旦收集了所有这些信息，就有可能可以判断一个湖泊的流量主要是由其表面还是地下的输入和输出导致。
The reaction releases the sodium hydroxide for reuse in the first step, while the CO2 could be stored in underground reservoirs that once housed oil and gas or be recycled into gasoline.
反应释放的氢氧化钠回到第一步中重新利用，同CO2可以被贮存到地下曾经贮藏石油或天然气的地层，或者被回收利用做成汽油。
They may help ensure that all the stranded miners will in time emerge from underground hell and once again get to admire the blue skies above.
他们可能保证所有被困矿工及时脱离地狱式的矿井，再次享受头顶的蓝天。
They will grow to a height of three feet and, once established, will spread underground by bulbs.
他们将长到三英尺高，而且一旦建立，将通过进一步灯泡地下。
Once she helped to hide an underground worker.
有一次她帮助藏起一个地下工作人员。
Once captured, the emissions will be 'injected' two kilometres underground, in what once was a natural gas reservoir.
一旦吸收后，排放量将会注入二公里的地底下曾是天然气体的储存器。
Liquid water-which is the form life needs-may well exist underground, and may still sometimes be seen at the surface, where dried-up rivers and lakes suggest it was once commonplace.
组成生命所需的流动水可能存在于地下，可能有时仍能在表层看见，表层中干涸的河流湖泊表明流动水曾经很普遍。
Born Georgios Kyriacos Panayiotou, he once played music on the London underground train system before forming Wham! With Andrew Ridgeley in 1981.
乔治·迈克尔本名乔治奥斯·吉里亚科斯·帕纳约托，出名前曾在伦敦地铁里演唱，后于1981年和安德鲁·瑞吉里组成威猛乐队。
Liquid water-which is the form life needs-may well exist underground, and may still sometimes be seen at the surface, where dried-up rivers and lakes suggest it was once commonplace.
火星地下很可能存在生命所需的液态，有时甚至在表层都能看见液态水——表层中干涸的河流湖泊表明其一度很普遍。
The space of underground transportation system is always small and poor ventilation. Once a blast occurs in the tunnel, it will cause serious casualties and great economic losses.
地下交通系统空间小、通风条件差，一旦受到爆炸荷载的冲击，往往造成惨重的人员伤亡和重大经济损失。
Once CO2 is sealed underground, the research center says it will not leak out.
一旦二氧化碳封存在地底下，研究中心说它就不会洩漏。
At present, we use wire communication underground coal mine in our country. Information is transmitted by electric cable. When the accident happened, the communication is discontinued at once.
目前我国煤矿井下通讯基本上是有线装置，依靠电缆传输信息，一旦发生事故，通信马上中断。
I am most afraid of night, whenever the mother call I go downstairs to shopping, I always hesitated once, only timidly underground floor.
我最害怕晚上，每当妈妈叫我去楼下买东西时，我总会犹豫一下，才胆怯地下楼。
Underground excavation leads to surface subsidence. Once the surface deformation value exceeds a certain limit, the railway in surface subsidence area will be seriously damaged.
地下开挖工程导致地表沉陷，一旦地表变形值超过一定界限时，地表沉陷区内的铁路就会受到严重破坏。
Underground excavation leads to surface subsidence. Once the surface deformation value exceeds a certain limit, the railway in surface subsidence area will be seriously damaged.
地下开挖工程导致地表沉陷，一旦地表变形值超过一定界限时，地表沉陷区内的铁路就会受到严重破坏。
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