二战期间,美国和苏联是盟友。

During World War II, the United States and the Soviet Union were allies.

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During World War II, the United States and the Soviet Union were allies.

allies 是名词 ally 的复数形式。ally 来自拉丁语 alligare(绑定在一起),指"同盟国、盟友",特指在战争或冲突中结成同盟的国家或组织。

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