Liu, whose hamstring has been an issue for months, limped out of the block at the starting gun, took a few awkward steps, then pulled up when the second gun sounded to signal a false start.

刘翔的跟腱已经伤了好几个月了，第一次发枪起跑时就有些一瘸一拐了，在第二枪鸣枪示意第一次起跑无效才停了下来。

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Lawmakers in California, the District of Columbia, as well as a handful on Capitol Hill said they intend to fight block 3-D gun printing technology.

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Lindsey Graham, a leading Republican and tough Obama critic, told CNN's Jim Acosta that he would not block a vote on gun control in the Senate.

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Although the Senate has rejected an attempt to block debate on expanded background checks for gun sales, leaders say debate over the actual bill could last weeks.

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