Country delegates are gathering at Beijing's Great Hall of the People for the signing ceremony.

各国代表将齐聚在北京人民大会堂，参加签字仪式。

Most Asian countries and countries from the Middle East and Latin America have joined, with the launch of the Beijing-led bank being hailed as a diplomatic and strategic success for China.

大部分亚洲国家以及一些中东、拉丁美洲国家已经加入亚投行，这一由北京领导的银行被誉为中国在外交和战略上的一次胜利。

It is one of several institutions China has created to push its own economic agenda, largely driven by frustration over its lack of influence in the big global financial institutions such as the World Bank, says the BBC's Martin Patience in Beijing.

BBC的马丁·佩申斯在北京指出，由于在世界银行等大型国际金融机构中缺乏影响力，中国已经创建了若干机构来推动自身的经济议题，亚投行正是其中之一。

The AIIB will begin with authorised capital of $50bn (£31.8bn), eventually to be raised to $100bn.

亚投行的初始注册资本为500亿美元，最终将增加到1000亿美元。

Delegates told Reuters in May that China was likely to hold a 25-30% stake, with India the second-biggest shareholder with a possible 10-15% stake.

今年5月，代表们告诉路透社，中国希望持有25-30%的股份。作为第二大股东，印度的持有的股份可能为10-15%。

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