和陌生人保持一定距离

题目

和陌生人保持一定距离
和不熟悉的人说话的时候,我会不由自主地和他保持一定距离.
下面是我造的句子,keep distance 觉得很怪.
If I talk with someone who I am really not acquainted with,I will have a defense which will keep a certain distance from him.
这句话对我来说有点难,最好能意译下哈,

答案

keep someone at arm's length 保持一定距离
和不熟悉的人说话的时候,我会不由自主地和他保持一定距离.
When talking with a stranger,I will naturally keep him/her at arm's length.