我们想去喜马拉雅山脉徒步旅行。

We want to go ___trekking in the Himalayas.

我听说她要去非洲进行一些徒步旅行。

I hear she's going to Africa for some ___trekking.

徒步穿越丛林可能很累人但很有收获。

___Trekking through the jungle can be exhausting but rewarding.