她与新同事保持距离，直到她觉得可以信任他们为止。

She ___kept her new colleagues ___at ___arm's ___length until she felt she could trust them.

尽管他们示好，但他更愿意与每个人都保持距离。

Despite their friendly overtures, he preferred to ___keep everyone ___at ___arm's ___length.

经理的专业素养要求她对所有下属都保持一定的距离。

The manager's professionalism required her to ___keep all subordinates ___at ___arm's ___length.