Sent_en: 2zh Iran's chief nuclear negotiator, Ali Larijani, and European Union foreign policy chief Javier Solana have executed four rounds of negotiations on Iran's nuclear program but have failed to make a breakthrough.
Sent_yy: 伊朗首席核谈判代表阿里·拉里贾尼和欧盟外交政策负责人哈维尔·索拉纳就伊朗核项目进行了四轮谈判，但都未能取得突破。