（标准）做最好的准备，做最坏的打算。
Strive for the best, prepare for the worst.
有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)
Hope for the best, (but) prepare for the worst.
Having the best preparation, and predicting the worst outcome.
be ready for the best
get prepared for the worst
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