While using static assertions, always remember that the expression being checked must be evaluable at compile time.

一定要记住，在使用静态断言时，检查的表达式在编译时必须是可计算的。

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Results: Among 176 patients, 172 were evaluable.

结果：176例患者中可评价近期疗效者172例。

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Initial enrollment was 109 subjects, but a high rate of attrition limited the number of evaluable subjects.

初始登记的受试者为109名，但受试者的高损耗率限制了评估的人数。

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