length ·phrase (IDIOM)
Definition: to not allow someone to become too friendly with you Level: C2
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.