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canyon
[名词]
a valley that is deep and has very steep sides, through which a river is flowing usually
峡谷, 深谷
Ex: They set up camp near the bottom of the canyon.他们在**峡谷**底部附近搭起了营地。
expedition
[名词]
a trip that has been organized for a particular purpose such as a scientific or military one or for exploration
探险, 任务
Ex: The space agency launched an expedition to explore Mars and search for signs of life .航天局发起了一次**探险**，以探索火星并寻找生命的迹象。
extraordinary
[形容词]
remarkable or very unusual, often in a positive way
非凡的, 卓越的
Ex: The scientist made an extraordinary discovery that revolutionized the field of medicine .这位科学家做出了一个**非凡**的发现，彻底改变了医学领域。
pond
[名词]
an area containing still water that is comparatively smaller than a lake, particularly one that is made artificially
池塘, 水池
Ex: In winter , the pond froze over , allowing people to enjoy ice skating and other activities on its surface .冬天，**池塘**结冰了，人们可以在其表面上享受滑冰和其他活动。
to protect
[动词]
to prevent someone or something from being damaged or harmed
保护, 防护
Ex: Troops have been sent to protect aid workers against attack .已派出部队**保护**援助人员免受攻击。
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