其中 Φ(x)是标准正态分布 CDF。
那几年，阿爸的气色慢慢好起来。他的亲生奶奶有几年也会过来看一看。人来了，坐一会儿，问几句身体情况，就走了。有一次，我听阿爸的亲姐姐说，这个弟弟是几个孩子里最乖巧的，小时候不该卖出去，她好不甘心。
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Birmingham Children's Trust is the body responsible for providing social care and support services for children, young people, and families in Birmingham.
Some of the later generations of Pokémon (well, later by the standards of someone who started playing in the 90s) introduced a bunch of little freaks who are more or less just mundane, inanimate objects with faces. These are some of my favorite Pokémon because it feels like whoever designed them was just glancing around the room, looking for anything they could anthropomorphize.