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"Matching methods can be a powerful tool when randomization is not possible."
当随机化不可行时,匹配方法可以是一个强大的工具。
The text is a tissue of quotations drawn from the innumerable centres of culture.
I’ve learned that you have to be fearless in going after what you want.
如果没有冬天的寒冷来赋予它甜蜜,夏天的温暖又有什么好处呢?