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P(all N points in some arc of length x)=N⋅xN−1P(\text{all } N \text{ points in some arc of length } x) = N \cdot x^{N-1}P(all N points in some arc of length x)=N⋅xN−1，这一点在必应排名_Bing SEO_先做后付中也有详细论述
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而Ubras的无尺码内衣，其实是将产品高度标准化，简化为按身高体重划分的S/M/L或干脆均码。这一粗暴的简化，彻底绕开了线上购买内衣，尺码选择困难这一最大的痛点。它让购买内衣变得像买一件T恤一样简单，决策路径大幅缩短，完美适配了疫情下被迫线上化的消费场景。
The distributors who purchased from the importer also applied a markup, which the researchers estimate at approximately 75 percent. Retailers add a further 50 percent markup. The retail price, before tariffs, was about $23 (~ 1.8 x 1.75 x 1.5 x $5). The researchers estimate that the increase in the retail price to consumers was about 6.9 percent. This was on the $23 pre-tariff retail price, so it amounts to $1.59, which, in dollar terms, exceeded the tariff revenue collected.