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。
So was born the echo-sounding apparatus, now in general use in ships.
这样就产生了目前各种船舶上普遍应用的回声探测仪。
Love falls in love with love comes like an echo sounding back searches its mirrored shadow within a look.
爱与爱彼此相恋，犹如回声在激荡，寻找镜中的影像，在短暂的一瞥中。
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