The guidebook warns against walking alone at night.

这本指南告诫夜间不要单独行走。

《牛津词典》

I prefer walking alone.

我更喜欢一个人散步。

youdao

To his surprise, he saw her walking alone in the rain.

令他吃惊的是，他看见她一个人在雨中走着。

youdao

who is on the streets in New York and she got mugged because she was walking alone at late at night,

她正在纽约的大街上走着。有一次她在夜间独自一人在街上走，遭遇了抢劫。

have to 课堂 - SpeakingMax英语口语达人

It's too late for you to be walking alone.

这么晚你最好不要一个人走了。

I'd better 实战 - SpeakingMax英语口语达人

Afterward, you spot her walking alone across the lawn of Old Queens, carrying a mortarboard she picked up.

NEWYORKER: Miss Lora

One dark evening in south London, a group of men slow their car behind a young woman walking alone.

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At about 02:00 BST his 15-year-old victim was walking alone through Central Park.

BBC: John Hinton performing card tricks