美国历史协会是服务于各个领域和各个行业的历史学家的最大的专业组织。
The American Historical Association is the largest professional organization serving historians in all fields and all professions.
一路上，他帮助组织了在美国历史上最长的警察的车队之一。
Along the way, he helped organize one of the longest police motorcades in the history of the United States.
一路上，他帮助组织了在美国历史上最长的警察的车队之一。
Along the way, he helped organize one of the longest police motorcades in the history of the United States.
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