美国也有些delta （河流聚集的三角洲）地带。沿着河岸去开几次车就知道，整片都是低洼。左岸右岸不会有剧烈差别

来源: oueeii 于 2023-08-05 11:32:49 [旧帖] [给我悄悄话] 本文已被阅读：次

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