The circle is symmetric, so place one point anywhere and ask whether the other three land in the same semicircle. Each of those 3 points independently has a 1/21/21/2 chance of landing in that half, so the probability should be (1/2)3=1/8=12.5%(1/2)^3 = 1/8 = 12.5\%(1/2)3=1/8=12.5%.
动态磁贴的逻辑，本质上是一种「用完即走」的设计——信息主动呈现，扫一眼就够，不必点开应用，不必沉浸其中。它鼓励效率，而不是停留。但现实世界走向了完全相反的方向。
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library, but intend to release a third-party evaluator library.
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