Scenes like these from past rounds of talks will play out again in front of the television cameras. Then, the negotiators will close the doors to debate how many centrifuges Iran will retain capable of enriching uranium that can be used to build a nuclear weapon. In addition, they all talk about what sort of inspections will be allowed, and how quickly economic sanctions will be lifted.
"I think there is a great deal of seriousness on both sides to come up with some sort of deal.”
Jane Kinninmont is the deputy head of the Middle East Program at London's Chatham House,she says although seven nations are involved, it mainly comes down to the United States and Iran.
“I think there is an interest on the part of both presidents in making a deal, and the feeling that if this opportunity is missed, they won't see a similar opportunity in their lifetime.”
Still, China and Russia are also at the negotiating table. They have presented a solid front with U.S. and European negotiators, but Russia, in particular, has a somewhat different view of Iran than the others. And its policy is a concern for the West, especially in light of its new, more aggressive policy in Europe.
“Russia wants to have its alliance with Iran, but it doesn't have a particular interest in seeing Iran really become a nuclear weapons power or become a much more independent actor.”
Kinninmont says the deal Russia just signed with Iran to reprocess its used nuclear fuel could help pave the way for an agreement. But Anoush Ehteshami, director of the international program at Durham University says it also raises concerns.
“Is Russia unilaterally deriving deals that could provide Iran with get out clauses outside of the negotiations that are happening with the P5+1?And for that, I don't have an answer yet because this is still far too fresh.”
More important for the coming round of negotiations is whether the sides can bridge the remaining gaps and then convince skeptics in their own governments to accept their compromises. Professor Ehteshami says in spite of the sometimes harsh rhetoric coming out of Tehran, President Hassan Rouhani will be able to do that.
“The negotiating team has a mandate from the people. They have given President Rouhani the mandate to see through this difficult phase.And his mandate was, his platform was, to end Iran's isolation and to open it up to the world. The only way Iran can do that is to bring closure to the nuclear crisis.”
The consequences of not doing that would be grave for Iran's economy, hit by sanctions and low oil prices, and could potentially lead to military strikes on its nuclear facilities. That all adds to the urgency of reaching an agreement, but does not make it any easier.
中俄两国也参与了此次谈判 。两国都与美国和欧洲谈判人员有着统一立场，但尤其是俄罗斯对伊朗问题有着截然不同的见解 。俄方的政策使西方感到担忧，尤其是目前对欧洲步步紧逼的新政策 。
金尼蒙特表示俄罗斯最近与伊朗签订允许加工伊朗核废料的协议可能为核协议铺平道路 。但杜伦大学国际关系学教授阿那什·艾特沙米称这也令人担忧 。
即将到来的会谈更重要的方面就是谈判各方能否缩小分歧，并说服政府中的持怀疑论者接受折中方案 。艾特沙米教授表示尽管德黑兰方面有时出现强硬言论，但哈桑·鲁哈尼总统有能力做到这一点 。
“谈判队伍接受了人民所赋予的使命 。而鲁哈尼总统的使命就是平安度过这个困难阶段 。而他的使命、也是他竞选时的纲领是：结束伊朗的孤立，对外界敞开大门 。而唯一方法就是结束有关伊朗核危机
如果得不到妥善解决，伊朗经济将面临严重后果 。这个国家已经蒙受制裁和低油价的打击，而且核设施还有可能受到军事打击 。这些因素都使得达成协议变得刻不容缓，但这并不能使事情变得简单 。
1.come up with 追赶上；提出；想出
Let's fingerprint the canoe, see if we come up with anything.
Howard Wilkinson has come up with an absolute corker of an idea.
2.lead to 导致；引起；通往
Politicians say it could lead to a dissolution of parliament.
The group proceeded with a march they knew would lead to bloodshed.
3.in particular 尤其，特别
He stares detachedly into the middle distance, towards nothing in particular.
The police haven't really done anything for the black community in particular.