NASA said it was pleased the spacecraft collected more sample material than expected.

美国国家航空航天局表示，飞船收集到的样本材料多于预期，这令他们非常满意。

The examinations of the sample material were carried out atom-by-atom with very sensitive instruments, the researchers said.

研究人员表示，他们用非常灵敏的仪器对样品材料逐个原子进行研究的。