光学渡越辐射（OTR）测量结果显示：OTR是由于超热电子输运穿越固体靶所致，而辐射区域呈圆盘状、有发散角、有光强分布；

Due Optical Transition Radiation(OTR) is produced by the hot electrons transport through solid targets, region of OTR is have lager radiation angle and optical intensity distribution.

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但是，作为人类，我们是通过进化来生存的动物，所谓的固体是我们无法穿越的，这些事物同样也是很迷人的。

But it's also fascinating that, because we're animals that evolved to survive, what solidity is to most of us is something you can't walk through.

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