书籍 Solutions - 基础 - 文化6

a valley that is deep and has very steep sides, through which a river is flowing usually

峡谷, 幽谷

a trip that has been organized for a particular purpose such as a scientific or military one or for exploration

探险, 远征

very unusual, special, or surprising

非凡的, 特殊的

an area containing still water that is comparatively smaller than a lake, particularly one that is made artificially

池塘, 水池

to prevent someone or something from being damaged or harmed

保护, 防护

a range of things or people with the same general features but different in some details

多样性, 类型