- /spam-ring\.example\..*/
对有些人来说是利器，对有些人来说是玩具。这很正常，所有工具都是这样。
，推荐阅读新收录的资料获取更多信息
If the early layers are for reading, and the late layers are for writing, what are the middle layers doing?
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Answer: $$LGP = \frac{150^2}{6^2} = 625$$ so 625 times more light. The telescope has much larger aperturer than the eye and allows more light which means even stars too faint to be detected by the eye can easily be brightened by the telescope so that they are easy to detect and study.