In present RFSS, system can only simulate one radiationcenter in one simulation cycle using single channel, which makes it hard to simulate multi - radar targets and distributed clutter.
现有的射频仿真系统在单通道中同一时间只能模拟一个辐射中心，因此难以对多目标与分布式杂波进行仿真。
2
Astronomers think most of the radiation in this nebula comes from the single hot and brilliant massive star just above the center of the image.
天文学家认为这个星云中大部分的辐射来自单个灼热和闪耀的大型星体，即图片中心的星体。
3
Powerful radiation from the stars is sculpting the surrounding dust, creating the ring-like structure seen at the center of this frame.