问题描述：
英语翻译
The announcement Saturday of his choice of Senator Joe Biden of Delaware included an Obama campaign text message to supporters.
（这句话是美国VOA慢速英语听力里面的原文.）
The announcement Saturday of his choice of Senator Joe Biden of Delaware included an Obama campaign text message to supporters.
（这句话是美国VOA慢速英语听力里面的原文.）
问题解答：
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