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4.例句：1. The trek to the top of Mount Everest is one of the most challenging hikes in the world.
攀登珠穆朗玛峰的徒步旅行是世界上最具挑战性的徒步之一。
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2.The trekkers were exhausted after a long journey through the wilderness.
经过长途跋涉穿越荒野后，徒步者们筋疲力尽。
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3.The trekking group set out early in the morning to explore the nearby mountains.
徒步旅行小组一大早出发，探索附近的山脉。