冯家杰先生和大家畅谈手机网络科技。
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科技世界 什么是 3G、4G？有 5G 吗？
Passengers use their smartphones to surf the Internet in a subway train in Hangzhou city, east Chinas Zhejiang province, China, 5 May 2014.
冯家杰先生和大家畅谈手机网络科技。
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Source: SBS
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