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問(wèn)一個(gè)腦洞大開(kāi)的問(wèn)題,(光)折射是為了更快地到達(dá)嗎? |
點(diǎn)評(píng)
有一萬(wàn)條路可以選擇,可是最捷徑的路有且只有只有一條,而光走的就是那條捷徑,這不神奇嗎,
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