Note: The main idea with most of these changes is to emphasis the timing aspect of the echo slam more.

注意：这样进行改动主要的目的在于加强回音击在游戏后期的作用。

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Timing an echo of radio waves is the principle on which radar operates.

计算无线电波 回声的时间乃是雷达运行所依据的原理。

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