New words：

plateau [plæˈtoʊ] n. 高原
waterfall [ˈwɔtərˌfɔl] n. 瀑布

Sample Sentences：

As the river drops from the plateau, it forms great waterfalls.
They were tired and ill and they could not walk up to the plateau.
He braved himself, held his breath and waddled through the waterfall.

waddle /ˈwɑːdl/ v. (鸭子似地)蹒跚行走，摇摆地行走

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