「Trek」是不是行山的意思？

Trek means to make a long or difficult journey, especially on foot.
It may say so for hiking.
for example:
1. We went trekking in Nepal.
2. During the expedition, we trekked ten hours a day.
3. I hate having to trek up that hill.

The other meaning for trek can be 遊行

trek:(長途而辛苦的)旅行 or 集體移居

行山可以用hiking