托福词汇之Light Fidelity

　　Imagine only needing to hover under a street lamp to get public internetaccess, or downloading a movie from the lamp on your desk. There's a newtechnology on the block which could, quite literally as well as metaphorically,'throw light on' how to meet the ever-increasing demand for high-speed wirelessconnectivity. Radio waves are replaced by light waves in a new method of datatransmission which is being called Li-Fi (Light Fidelity).

　　想象一下这样的场景，在街灯下走两步就能连入公共区域因特网，通过桌上的台灯就能下载电影。现在，有这样一种新技术就可以解决上述这些高速无线网络连接的需求问题。这种新技术叫做Li-Fi(光保真)技术，是用光波取代无线电波传输数据的技术。

　　As well as being a potential solution to our ever-increasing hunger forbandwidth, Li-Fi has other advantages over WiFi, such as being safe to use on anaircraft, in hospitals and medical devices, and even underwater, where WiFidoesn't work at all. Research suggests that Li-Fi has the potential to befaster, safer and cheaper than conventional WiFi technology.

　　除了能够解决带宽需求以外，Li-Fi相对于WiFi的优势还有：能够在飞机和医院等场合无障碍使用，甚至在WiFi不能到达的水下区域，Li-Fi也能大展拳脚。而且研究显示，Li-Fi会比传统的WiFi更快、更安全、更省钱。