All threads that are not daemon threads have died, either by returning from the call to the run method or by throwing an exception that propagates beyond the run method.

非守护线程的所有线程都已停止运行，无论是通过从对run方法的调用中返回，还是通过抛出一个传播到run方法之外的异常。

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He's a founding partner of African DNA, which offers African-American clients a method of tracing their history beyond 1870, the year where federal census records end in the "black hole of slavery, " Mr. Gates says.

WSJ: Henry Louis Gates Jr. on 'Finding Your Roots'