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一个疑似中国间谍的气球被发现漂浮在美国上空，引发了人们对北京为什么会使用这种工具进行监视的疑问。
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专家认为，该气球更多的是作为一种 “信号”，而不是一种安全威胁。
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这个气球是在美国国务卿安东尼-布林肯访问中国的前几天被发现的
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该气球被认为不是一种安全威胁，而更像是向美国发出的信息。
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几个世纪以来，气球技术一直被用于监视，目前正在考虑由美国军方使用。
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气球通常在地球表面上空24公里至37公里（80,000英尺-120,000英尺）之间飞行。
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美国国防部宣布，一个 "明显高于民用航空交通活跃地区 "的气球可能来自中国。
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中国专家本杰明-何认为发送气球是为了向美国发出信号，并观察他们的反应。
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Ho还认为，中国拥有更复杂的监视技术，可以用来监视美国的基础设施和信息。
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这个气球可能是中国试图测试美国安全和反应能力的一部分。
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中国可能使用了一个高空气球作为穿透美国领空的技术能力展示。
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来自卡内基国际事务伦理委员会的阿瑟-霍兰-米歇尔认为这是个潜在的原因。
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气球可以安装现代技术，如间谍相机和雷达传感器。
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使用气球的优势包括比无人机或卫星更便宜，更容易部署。
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气球的速度比卫星慢，使其能够更长时间地监测目标区域。
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气球在某些导弹基地附近的预期飞行路线表明，它不太可能偏离航线。
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美国国防部高度肯定该气球是中国的。
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这一事件表明，尽管中国政府没有承认，但中国继续努力监测美国的导弹基地。
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A suspected Chinese spy balloon was found floating over the US, prompting questions about why Beijing would use such a tool for surveillance.
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Experts believe that the balloon serves more as a “signal” than a security threat.
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The balloon was spotted days before US Secretary of State Antony Blinken’s visit to China.
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The balloon is thought to be less of a security threat and more of a message to the US.
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Balloon technology has been used for surveillance for centuries, and is currently being considered for use by the US military.
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Balloons typically fly between 24km and 37km (80,000ft-120,000ft) above the earth’s surface.
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The US Department of Defence announced that a balloon “significantly above where civilian air traffic is active” was likely from China.
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China expert Benjamin Ho believes the balloon was sent to send a signal to the US and observe their reaction.
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Ho also believes China has more sophisticated surveillance technology that could be used to spy on American infrastructure and information.
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The balloon could be part of China’s attempts to test US security and response capabilities.
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China may have used a high-altitude balloon as a demonstration of technological capability to penetrate US airspace.
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Arthur Holland Michel from the Carnegie Council for Ethics in International Affairs suggested this as a potential reason.
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Balloons can be fitted with modern technology such as spy cameras and radar sensors.
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Advantages of using balloons include being less expensive and easier to deploy than drones or satellites.
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The balloon is slower than a satellite, allowing it to monitor the target area for longer periods.
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The balloon’s anticipated flight path near certain missile bases suggests it is unlikely it has drifted off course.
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The US Department of Defence has a high degree of certainty that the balloon is Chinese.
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This incident shows China’s continued efforts to monitor US missile bases, despite the lack of admission from the Chinese government.
链接：Why would China use a spy balloon when it has satellites? - BBC News