Associated Press Science Writer Seth Borenstein contributed to this report from Washington.

来自华盛顿的联合社科学作者SethBorenstein对此篇报道作出了贡献。

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Associated Press Science Writer Seth Borenstein contributed to this report from Washington.

来自华盛顿的联合社科学作者SethBorenstein对此篇报道作出了贡献。

youdao