canyon
a valley that is deep and has very steep sides, through which a river is flowing usually
峡谷
[名词]
expedition
a trip that has been organized for a particular purpose such as a scientific or military one or for exploration
有组织的旅行
[名词]
pond
an area containing still water that is comparatively smaller than a lake, particularly one that is made artificially
池塘
[名词]
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