a. 单独的,仅仅，独自一人的

Man can't live on(by,with) bread alone.人不能仅靠面包维生。

Don't leave me alone. 别留我一人儿。

Enjoy being alone. 享受一个人独处的乐趣。

I was alone last night.我昨晚孤单一人。

You're not alone.你不是孤单的。

ad. 单独地

Stand alone. 一个人站着。