Definition: when you go on a long, difficult trip on foot Level: B2
我们想去喜马拉雅山徒步旅行。
We want to go ___trekking in the Himalayas.
我听说她要去非洲徒步旅行。
I hear she's going to Africa for some ___trekking.
穿越雨林徒步旅行需要良好的体能。
___Trekking through the rainforest requires good physical fitness.
