Visible light telescopes can resolve a piece of sky just a few arc seconds across — at least 60 times a smaller patch of sky than can be resolved with the human eye.
光学望远镜在数角秒内就能获取一张星空图—至少比肉眼能获取的大60倍。
Several arc echoes at the posterior segment of eye were detected in the silicon-oil-filling eyes with retinal detachment.
合并视网膜脱离的硅油填充眼可见眼后节多个弧形回声带。
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