A broken blue line means the course of a waterless valley.
蓝色虚线代表无水流过的山谷走向。
This is part of what led us to the realization that Lechuguilla is in that small group of waterless caves.
这是让我们认识到雷修古拉是为数不多的没有水的洞穴的原因之一。
Scientists think Earth started off as a waterless mass of rock.
科学家认为,地球最开始只是一团无水的岩石。
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