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协定；契约；盟约；条约
A pact is a formal agreement between two or more people, organizations, or governments to do a particular thing or to help each other.
例句
Last month he signed a new non-aggression pact with Germany...
上个月，他与德国签订了新的互不侵犯条约。
The other two opposition parties cannot agree on an electoral pact between themselves.
另外两个反对党之间无法就选举达成协议。