From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120,000 light-years.
从一端到另一端，银河系布满星星的圆盘横跨12万光年，可以用肉眼和光学望远镜观察到。
From end to end, the Milky Way's starry disk, observable with the naked eye and through optical telescopes, spans 120, 000 light-years.
它是一个布满星星的圆盘，从一端到另一端跨越了120,000光年。你可以用肉眼，也可以通过光学望远镜观察银河系。
Any of a group of eye diseases characterized by abnormally high intraocular fluid pressure damaged optic disk hardening of the eyeball and partial to complete loss of vision.
青光眼一种眼疾，症状是眼内液体压力超常的高，眼膜受损，眼球硬化，部分以至完全丧失视力。
Any of a group of eye diseases characterized by abnormally high intraocular fluid pressure damaged optic disk hardening of the eyeball and partial to complete loss of vision.
青光眼一种眼疾，症状是眼内液体压力超常的高，眼膜受损，眼球硬化，部分以至完全丧失视力。
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