昨天出去散步时我无意中遇到了他。

I met him by chance out walking yesterday.

《柯林斯英汉双解大词典》

这些小男孩儿在我们散步时很乖。

The boys were as good as gold on our walk.

《柯林斯英汉双解大词典》

我在花园里散步时遇到了一条大蛇。

I was walking in the garden when I met a large snake.

youdao

So I have that experience in great mountain vistas and I had that experience walking by myself in the institute woods in Princeton.

登上高山远眺，我体会到了这种感觉,当我独自在普林斯顿,我们学院的小树林散步时，也有过这种体验。

普林斯顿公开课 - 人性课程节选