\[l'_i(x_i)=\prod_{\substack{0\leq j \leq n \\ j \neq i}}(x_i-x_j)\]
the preposition mid
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The phones were set behind glass, so I couldn't touch them, but I was still able to get a really good look at all four colors on offer.，详情可参考im钱包官方下载