求翻译：现在的美国联邦证人保护法律的内容体现在1997年10月修订的美国法典第9-21章（USAM Chapter 9-21） ，共有30条，对证人保护的对象、批准程序、保护措施、被保护的证人的权利与义务等都进行了祥细的规定是什么意思？

U.S. federal witness protection law's content reflects a total of 30 in the October 1997 amendments to the United States Code, Section 9-21 (usam chapter 9-21), the object of witness protection, approval procedures, protective measures, protection witnesses of their rights and obligations and so det

Now the United States federal witness protection law in October 1997 the First Amendment of the United States Code Chapter 9 - 21 (USAM Chapter 9 - 21), there were a total of 30, the object of the witness protection program, and approval, protective measures, and the protection of the rights of witn

The present American federation witness protects legal the content to manifest the American statute book 9-21st chapter which revised in October, 1997 (USAM Chapter 9-21), altogether had 30, protected the object, the authorized procedure, the protective measures, witness's right and the duty to witn

Current United States Federal witness protection laws embodied in the October 1997 amendments of the United States Code, chapter di9-21 (USAM 9-21 Chapter), a total of 30 articles, objects, approval procedures, protection of witness protection measures and the protection of the rights and obligation

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