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For a receiver antenna, the real target signal is basically of plane waves.
对接收天线而言，实际目标基本上是平面波。
youdao
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The sound waves from the plane can speed on ahead of the plane.
来自飞机的声波能跑到飞机的前面。
youdao
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The sound waves from the plane can speed on ahead of the plane.
来自飞机的声波能跑到飞机的前面。
youdao