根据世界卫生组织的定义，一对夫妇12个月以上未采取任何避孕措施，性生活正常却未孕，就属于不孕不育。女性称为“不孕症”，男性称为“不育症”。
Source: Computational Materials Science, Volume 266
。业内人士推荐91视频作为进阶阅读
Trade between the EU and two South American countries may start within two months under a provision application of the Mercosur deal.
Analysts say a tie-up could offer benefits to the struggling traditional pay TV networks as well, giving them greater clout in business negotiations and presenting opportunities for cost savings.