line-of-sight什么意思line-of-sight在no other infrared remote controlled systems are in line-of-sight 是视线状态麽?还是处于激活状态! 英语
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【答案】 line of sight
n.（名词）
【复数】 lines of sight缩写 LOS
An imaginary line from the eye to a perceived object.
视线：从眼到被观察物之间的想象的线
An unobstructed path between sending and receiving antennas.
瞄准线：能够直接从发射点到接受点的线