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单语范例（未经PONS编辑处理）
But, the AEC was lax in enforcement of the rules; AEC commissioners did not establish national radon standards at the time the studies were released.
en.wikipedia.org The AEC was responsible for managing atomic energy development for the military as well as for civilian use.
en.wikipedia.org An apical ectodermal cap (AEC) forms on the tip of the stump.
en.wikipedia.org An additional 14.88 acre were transferred to the AEC in 1964.
en.wikipedia.org It began trading in 1989, when the company released its first models of an AEC bus and truck.
en.wikipedia.org