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。
Tips: stick to the end of the cloth is level, don't post into arc, open your eyes to pull carry eye end.
Tips：贴布的尾端要呈水平，不要贴成弧形，睁眼时就能拉提眼尾。
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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