然而，确保实现此目标的最好方式——向良心犯致函以及为良心犯致函——却已经退缩了。
Yet the best means of ensuring that—writing letters to, and about, prisoners of conscience—has shrunk.
如果函数调用成功，返回值指定导致函数返回的事件。下表为可能的返回值。
If the function succeeds, the return value indicates the event that caused the function to return. The following table shows possible values.
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