沟系
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Ravine system debris survey 沟系岩屑测量
ravine system
峡谷系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Following a navigation system's instructions without driving into a ravine is hard enough as it is -- can you even imagine how hard it'd be if you kept losing GPS reception every time you drove within range of an LTE tower?
ENGADGET: US Air Force raises concerns over LightSquared's LTE network messing with GPS
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