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To do this we need a fast light switch.
为此我们需要有一个快速的光开关。
youdao
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Can you tell me how fast light travels?
你能告诉我光速有多快吗？
youdao
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Have you any idea how fast light travels?
你知道光速有多快吗？
youdao
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He asks the teacher how fast light moves.
他问老师光的速度是多少。
youdao
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He asks the teacher how fast light moves.
他问老师光的速度是多少。
youdao