Various prophets of doom have suggested that standards in education are worse than ever.
各种各样杞人忧天的人认为,教育水平比以往任何时候都低。
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(原版) 

精讲 Wireless fidelity. Technically, it's a standard ensuring that equipment works on a wireless network. It's on analogy with 'hi-fi', for high fidelity, that used to be common for recording some years ago.
Wifi全称为wireless fidelity.(无线保真),从专业的角度讲,是一种确保不需要线缆也可使用因特网的技术。 Wifi和hi-fi(高保真)相似--“高保真”一词多年前就出现了,是用来形容唱片音效的。
演讲合辑