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He was between sheets by eleven.

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我进屋时，他在读书。

我再向外看时，他已抱了朱红的橘子往回走。

According to the author, Australian society is different from Asian societies because car accidents cause most deaths in Asian societies.

设随机变量X与-X服从同一均匀分布U[a，b]，已知X的概率密度f(x)的平方f2(x)也是概率密度，则b=______．