The idea of inflatable spacecraft is not new. The Echo I - NASA's first communication satellite - was essentially 100-foot-wide Mylar balloon that reflected radio transmissions from the ground.
充气式航天器并不是什么新颖的想法，NASA的第一颗通讯卫星回声1号实际上就是一个宽30米的聚酯薄膜大气球，它是用来发射来自地面的无线电广播的。
We use … used it to track potentially dangerous asteroids, sending out a strong pulse of radio waves and listening for the echo.
我们通常…通常用它来跟踪有潜在危险的小天体，发出强大的无线电脉冲然后聆听回波。
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。
Each cell can scatter radio wave so that total echo received by fuse is sum of each scattering echo vector.
每个单元都会散射电磁波，总的回波是各个散射波的矢量和。
Each cell can scatter radio wave so that total echo received by fuse is sum of each scattering echo vector.
每个单元都会散射电磁波，总的回波是各个散射波的矢量和。
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