没有理由禁止私人企业将黄金和白银铸造成币来与美元进行竞争。
There is no reason to ban private companies from minting gold and silver coins to compete with the dollar.
但这道武器禁令却有着一个善良的理由：避免私人安保公司造成毁灭性的误伤。
The rules are there for a good reason: to guard against devastating collateral damage by private security forces.
第二个理由比较私人。
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