上游河段的床面为沙垄所覆盖，而下游河段则为平整床面。
In the upper reach the bed was dune covered and in the lower reach it was flat.
对受汞污染的蓟运河下游河段的抗汞细菌进行了系统的调查。
A systematical survey of mercury resistant bacteria in downstream of Jiy-un River polluted by mercury has been carried out.
大同水文站在扬子江下游河段采集到自2003年以来最高的水位。
The Datong Hydrological station in the lower reach of the Yangtze River, has recorded the highest water levels since 2003.
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