无线GPS信号
注:off-the-air是over the air的同义词, 是“经由空气,源自空中”的意思,我们通常也笼统翻译为“无线”的意思,这个词经常引起人们的误解(源于维基百科)。
下面是维基百科的原文:
Also, off-the-air may be synonymous with over-the-air or from-the-air, as in picking up a terrestrial broadcast TV station off-the-air instead of from cable TV. As this usage may be confusing due to the term’s other meanings, the terms "over the air" or "on the air" are more standard in the broadcasting industry