to walk a long distance, usually over land such as hills, mountains, or forests

We spent the day trekking through forests and over mountains. 白天我们穿过丛林，翻山越岭。

informal I trekked (= walked a long and tiring distance) all the way into town to meet him and he didn't even turn up. 我大老远好不容易进城来看他，他却连面都不露一下。

a long walk over land such as hills, mountains, or forests

We did an eight-hour trek yesterday. 昨天我们走了8个小时。

a walk that is long and difficult or makes you feel very tired

You can walk to town from here, but it's quite a trek. 你可以从这儿走到城里去，但是路有些远。