The period of present riverbed formed.
现代河床形成时期。
There are many pebbles on the riverbed.
河床上有很多卵石。
We usually play on the riverbed when the river dries up.
小河断流时，我们经常在河槽上玩耍。
River section analysis is the foundation of riverbed evolution analysis.
河道断面分析是河床演变分析的基础。
At the same, it put forward the key subject on the rock riverbed scour study.
同时提出岩石河床冲刷研究的关键课题。
At the same, it put forward the key subject on the rock riverbed scour study.
同时提出岩石河床冲刷研究的关键课题。
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