轮廓系数是一种衡量聚类效果的常用指标，它可以衡量一个样本在该类中的相似度，从而判断聚类的好坏。其公式为：si = (bi - ai) / max(ai, bi) 其中si为轮廓系数，bi代表样本i在所在的簇内部平均凝聚力（Average Intra-Cluster Distance）,ai代表样本i到其他簇中所有样本平均分离力（Average Nearest Cluster Distance）。...
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Extreme sports for kids are on the rise, with more technical tricks and stunts on skateboards, mountain bikes, scooters, and even motorized vehicles becoming increasingly popular. As the popularity of extreme sports continues to grow among kids, safety is becoming an important issue for parents to c...<未完>点击进入
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亲爱的， 你是我最爱的人，也是我生命中最重要的一部分。每当你出现在我身边，我就会有一种不可思议的幸福感。你令我心动，令我喜欢安宁而充满希望。 你永远是那么可爱、活泼、善良、勇敢和强大。无论多么艰难困苦，无论世界如何变化，你都将始终如一地陪伴在我的左右。 想念之情正在升华；思念之意已深入心底。时间尽头依然相遇——此刻此刻正是那永不逝去的浪漫时光。 在这特别耀眼耀眩的星光下——一道道闪亮弹舞；一声声歌唱中——对诗意释出对彩铃般天真单纯吧…… 时间来临前再相逢——待甜蜜永远流传不衰…… 生命中能够遇上这样特别的女孩子，就好似手上能够得到明亮闪耀的宝物般——独一无二地幸运...<未完>点击进入
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Stress can have a significant impact on a person's life. It can lead to physical and mental health problems, including anxiety, depression, sleep disorders, digestive issues, heart disease, headaches and weakened immune systems. Stress can also affect relationships by causing communication problems ...<未完>点击进入
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A good job is one that is both meaningful and rewarding. It should provide an opportunity to grow professionally, to develop new skills, and to make a positive impact on the lives of others. A good job should also offer a competitive salary and benefits package, as well as flexible working hours tha...<未完>点击进入
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To be the person I want to be, I think it is important to continually strive for personal growth. This means staying open-minded and learning new skills, taking on new challenges, setting goals and striving to reach them, and having a positive attitude even when things don't go as planned. It also m...<未完>点击进入
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