The scientists had performed similar analyses on Earth rocks and on meteorites, so they decided to duplicate the research on the lunar samples.

科学家们已经在气球岩石和陨石上做过类似的分析，所以他们决定在月球的样品上重复这个实验。

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The SIMS technique bombards the lunar samples with a primary ion beam that allows the researchers to separate the ions with a magnet, depending on the charge.

SIMS技术可以以离子束轰击月岩样本，从而使研究人员调整电荷水平，用磁石分离出离子。

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Analysis of the lunar samples and impact craters has shown that the Moon's surface was solid 4.3 billion years ago, yet the oldest impact rocks among the samples are 3.9 billion years old.

对月亮石样本和影响的火山口的分析表明月亮表面在43亿年前凝固，然而，样本里面最古老的影响岩石却只有39亿年。

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The lunar samples would be the central feature of an "Apollo Exploration Award" to be given to every Apollo astronaut or a surviving family member.

CNN: House approves moon rock giveaway to Apollo survivors

But, a detailed analysis of the lunar samples by Kuni Nishiizumi, from the University of California at Berkeley, and Marc Caffee, from Purdue University, suggests that far more beryllium exists in the soil than can be accounted for by cosmic-ray delivery alone.

BBC: Apollo samples reveal Moon's origin

These include sending an unmanned rover to the lunar surface as well as sending a probe to collect surface samples and return them to earth.

ECONOMIST: China launches a rocket and aims for the moon