Another additional hurdle, developing tiny GPS receiver chips that could be embedded yet still be sensitive enough to receive signals from thousands of miles out in space.
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而另一个不可忽视的因素则是全球定位系统信息接收芯片,它不但要能植入人体内,并且还应有足够的灵敏度,以接收来自几千英里外的太空定位卫星群发来的信息。
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