When light is focused even more as a laser beam, it can cut through steel.
当光被集中成为雷射线时，连钢铁都能穿透切断。
The beam does not spread out appreciably, even at large distance from the source.
它的光束，即使离光源极远，也不显著扩散。
The beam does not spread out appreciably, even at large distance from the source.
它的光束，即使离光源极远，也不显著扩散。
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