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According to the theory of relativity, nothing can travel faster than light.
A search is now under way to confirm the suspected existence of particles of matter that move at a speed greater than light.

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Open the tool →光速 (guāng sù) means “speed of light”.
光速 is pronounced guāng sù in Mandarin Chinese.
“speed of light” is 光速 (guāng sù) in Chinese.
This page has 2 example sentences using 光速, each with pinyin and an English translation.