我总是觉得她对我保持距离。

I always had the feeling she was ___keeping me ___at ___arm's ___length.

起初，她对他们保持距离。

At first she ___keeps them ___at ___arm's ___length.

他更喜欢与同事保持距离以维持专业性。

He prefers to ___keep his colleagues ___at ___arm's ___length to maintain professionalism.