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used to suggest an action or to show that it is necessary
用于建议采取行动或表明有必要;最好
You had best tell her (= it would be wise if you told her) that you won't be able to come to her party.
你最好告诉她你不能参加她的聚会。
We'd best be going now (= we should go now).
我们最好现在就走。