以下为句子列表：
英文: FSO is already used in a few niches: to connect networks in nearby offices without having to string cables between them, for example.
中文: 无线光通信在几个领域已经得到应用：比如，在相邻的办公室之间建立网络而不用布线。
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英文: FSO is also secure: the only way to intercept the signal is physically to intercept the beam.
中文: 无线光通信也很安全：阻断信号的唯一办法就是物理阻断光束。
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英文: FSO is not possible with existing indoor lighting because incandescent bulbs cannot switch on and off fast enough.
中文: 无线光通信在现有室内光源的情况下不可能实现，因为开关速度不够快。
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英文: Futuristic though this sounds, FSO is by no means a new idea.
中文: 尽管这听起来都是未来发生的事情，但无线光通信技术并不是什么新概念。
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英文: There is no messing about with radio-spectrum licences or digging up roads, and FSO can also bypass prohibitive planning restrictions.
中文: 另外，也用不着折腾申请无线电频道许可证或者把道路挖开埋光缆，同时，无线光通信也能够绕过禁止性的规划限制。
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