词典释义：
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Jack still sees the beam dropping down and Jill still sees the light beam travel a longer distance, except this time Jack and Jill cannot disagree on the speed because the speed of light remains the same no matter what.
杰克依然会看到光束反弹吉尔还是会看到该光束移动得更远，例外的是，这次杰克和吉尔却会对光的速度有分歧。这是因为光的速度无论如何还是保留不变。
《TED-Ed》《TED教育》
双语例句
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A light beam rushed to the night sky.
一道光束冲向夜空。
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Not only that, consider the path taken by a light beam.
不仅只会这样，考虑一下一束光的路经。
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The light beam can be steered more accurately than a mechanical cutter.
这种光束比机械切削器能运转得更为精确。
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Signal transmission is realized by transmitting light beam over optical fiber.
信号传输是通过光纤传输光束来实现的。
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Imported optical mirror, reduce wastage of laser power, high quality of light beam.
进口光学激光镜片组，激光功率光损耗低，光束质量好。
近义词
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