These structures had been detected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling.
这些结构在早些年曾被回声探测器探测到，但是它们从未被钻探过。
These structures had been detected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling.
这些结构在早些年曾被回声探测器探测到，但是它们从未被钻探过。
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