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。
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。
The Sahara does not fit the traditional idea of an entirely flat and waterless area.
撒哈拉不符合传统观念，具有完全的单位和无水区。
The Sahara does not fit the traditional idea of an entirely flat and waterless area.
撒哈拉不符合传统观念，具有完全的单位和无水区。
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