域名权重
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域名权重是预测域名在搜索结果中排名表现的评分（通常按 0-100 计算）。虽然不是 Google 的官方指标，但反向链接质量、域名年龄和内容相关性等因素都会影响域名的权重评估。
示例
wikipedia.org has a domain authority of 100, while a new .xyz domain might start at 1. Authority builds over years through quality content and backlinks.