"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, people used too much underground water.
过去，人们使用了太多的地下水。
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 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。
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。
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