第三人称单数： quintuples
过去式： quintupled
过去分词： quintupled
现在分词： quintupling

But 900km will have to be dredged to make the river fully navigable , which would quintuple its shipping capacity .

但是900公里的路途必须要疏浚来使河流保持完全可通行状态，这将使它现在的通航容量提高5倍。