Water has a much higher index of refraction than air, and so the relative index of refraction between water and the fiber is much lower than between air and the fiber.
水的折射指数比空气还要高，因此水和纤维之间折射的相对指数要远低于空气和纤维的相对指数。
Water has a much higher index of refraction than air, and so the relative index of refraction between water and the fiber is much lower than between air and the fiber.
水的折射指数比空气还要高，因此水和纤维之间折射的相对指数要远低于空气和纤维的相对指数。
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