他一个人旅行。

He's travelling alone.

youdao

我鼓励人们去旅行的原因有很多，我知道这些经历会让一个人变得更好。

There are many reasons why I encourage people to travel, and I know that the experience will make one a better person.

youdao

我不得不一个人来，因为克拉拉病得很重，不能旅行。

I had to come alone, for Clara has been very ill and could not travel.

youdao