科技世界 什麼是 3G、4G？有 5G 嗎？
Passengers use their smartphones to surf the Internet in a subway train in Hangzhou city, east Chinas Zhejiang province, China, 5 May 2014.
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馮家杰先生和大家暢談手機網絡科技。
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Passengers use their smartphones to surf the Internet in a subway train in Hangzhou city, east Chinas Zhejiang province, China, 5 May 2014.
