洪水过后,河床上留下了许多鹅卵石。

After the flood, many pebbles were left on the streambed.

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After the flood, many pebbles were left on the streambed.

streambed 是复合名词,由 stream(溪流)和 bed(床、底部)组成,字面意思是"溪流的底部",即"河床"。

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