Difficult to punish a wrongdoer or deal with a problem when they have strong protection or are in an inconvenient position to be directly confronted, much like a rat hiding by a valuable object that one is reluctant to damage.
那个小偷常常躲在社区保安室旁边，让居民们器鼠难投，不知道该如何处理。
That thief often hid near the community's security office, making it difficult for residents to deal with him, like a "rat by the utensil" that is hard to hit.
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