Only seven months ago, scientists caller her X Woman.

七个月以前，科学家将这块遗骨化石命名为女子X。

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During a seven-day auction on eBay that ended on May 29, Novocin says he sold four items, including an X-Band Weather Radar Modulator for and a high-frequency radio circuit card for .

最后，经过七天的竞价，诺沃辛卖出了四件零件，包括以500美元的售价卖出一个雷达调节器和以32美元卖出一个高频无线电电路板。

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Scottie Roberson, 38, chose the personalised plate as a combination of his nickname "Racer X", and his favourite number, seven.

现年38岁的Scottie Roberson用他的外号“赛车手X”与幸运数字“7”组合出这套个性车牌。

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The first plane ever to fly faster than the speed of sound was the X-1 in nineteen forty-seven.

VOA: special.2010.07.07

One of them,the Apollo-11, traveled to the moon just seven months after the last X-15 flight.

VOA: special.2010.07.07

The only tragedy connected with the X-15 program happened in nineteen sixty-seven.

VOA: special.2010.07.07

He later flew the North American X-15 seven times, ultimately reaching an altitude of 207, 500 feet.

FORBES: Neil Armstrong's Immortal Footprint

In research presented Thursday at a Heart Rhythm Society meeting in Boston, 110 patients at seven hospitals who were checked with X-rays showed a 25% rate of externalized leads.

WSJ: Agonizing Choices for Heart Patients

Our first incentivized competition, the Ansari X PRIZE, went to Scaled Composites, which beat out 26 teams from seven countries to become the first to build and launch a private space vessel that could carry three people 100 kilometers into space twice within two weeks.

FORBES: Launching the Next Era in Space Travel and Exploration