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。
There are many pebbles on the riverbed.
河床上有很多卵石。
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。
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。
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