...）方法定义咋thread类内，启动新线程最贱的办法就是让该对象所属的类直接继承thread类，而该对象就成为线程对象（thread object）。thread类常用的方法如下
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Besides the memory required for the thread object, each thread requires two execution call stacks, which can be large.
除了Thread对象所需的内存之外，每个线程都需要两个可能很大的执行调用堆栈。
The rules for references between objects of different lifetimes may prohibit member variables in the thread object itself from containing references to these objects.
具有不同生存期的对象之间的引用规则可能会禁止线程对象自身的成员变量包含对这些对象的引用。
The specific exception can be retrieved from the thread object.
可从线程对象中检索特定异常。
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