“再细心也不为过”的意思就是：不管是老师布置的家庭作业还是公司老板下达的任务，尽可能花更多的时间保证自己所做的是最棒的。或者是说，你在保护家庭或是自身安全时，再细心也不为过。

A: "you can never be too careful" means it's good to spend as much time as possible to do a careful job to make it your best job when it comes to school homework or your office.

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