can not...too...   再……也不过分
    例1: We cannot be too careful of health. 我们无论如何注意健康也不为过。
    例2: You cannot be too careful when you drive a car. 你开车时再小心也不过分。
    例3: We can not be too faithful to our duties. 我们必须尽力忠于职守。

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