Today, my boyfriend of five years gave me an information packet on Nuva-ring.

今天在一起五年的男朋友给了我一张节育环的宣传单。

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Cephalotaxine is one compound of five-fused ring structure.

三尖杉碱具有五元稠环结构。

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Cephalotaxine is one compound of five-fused ring structure.

三尖杉碱具有五元稠环结构。

youdao