以下为句子列表：
英文: The Commonwealth (of nations) is a free association of independent countries that were once colonies of Britain. It was founded in 1931, and has 50 member countries until 1991.
中文: 英联邦是曾为英国殖民地的、但现已独立国家所构成的自由联合体。它成立于1931年，至1990年止已有50个成员国。
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