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That is why high schools in some states require that their students study foreign languages or complete three years of math, while high schools in other states don't have those requirements.
这就是为什么有些州的中学要求学生学习外语或修完三年的数学课程，而其他州的中学却没有那些要求。
States also have the power to provide protection for the people who live there, and they do this by having state police forces (or groups of people and organizations that protect ordinary people).
各个州还有为州内居民提供保护的权力，它们是靠州内的警察机关做到的（或保护一般的人的一群人和组织）。
The federal (or national) government has an army for fighting internationally, but the states have the police to take care of problems within the state.
联邦（或国家）政府拥有在国际上作战的军队，而各个州拥有警察来处理州内的事务。
Individual cities can have police forces, too.
个别城市也可以拥有警察机关。
Each of the fifty states are also responsible for providing safety for the people who live there.
五十个州都有为州内居民提供安全的义务。
They do this by having firefighters who can put out (or end) fires when they get out of control.
它们是靠扑灭（或终结）失控大火的消防员做到的。
Driver's licenses (or permission to drive a car) are under the domain (or responsibility) of the states.
驾照（或开车许可证）由各大州控制。
Each state can decide who is allowed to get a driver's license, and those driver's licenses look different in each state.
每个州能决定谁可以得到驾照，每个州的驾照看起来都不相同。
There is no national driver's license in the United States.
美国没有国家驾照。
Finally, individual states have the power to approve zoning and land use, or the rules for what kinds of things the land can be used for, such as for housing, business, or parks.
最后，各州拥有批准分区和土地使用的权力，或决定土地的用途，比如用于住房、商业或公园。
The federal government cannot tell the states how to use their own land unless there is federal land within a state.
如果联邦政府在某个州内没有土地，那它就不能命令这个州该如何使用它们的土地。
译文为可可英语翻译，未经授权请勿转载！
