继任的系统同样是设计用来2020年重返月球的，同时作为远征火星的踏脚石。
That successor system is also designed to return humans to the moon by 2020, as a stepping stone to visiting Mars.
把人类送上火星进行探测的一种方法，是在月球上建立一个基地，用来作踏脚石。
One way for human missions to Mars is to set up a base on the moon to be used as a steeping-stone.
这些蛋白石硅酸盐是由火星侦探卫星上搭载的专用小型侦察影像频谱仪发现的，是三种含水矿物中最年轻的一种。
These opaline silicates were detected by MRO's Compact Reconnaissance Imaging Spectrometer for Mars and are the youngest of the three types of hydrated minerals.
这些蛋白石硅酸盐是由火星侦探卫星上搭载的专用小型侦察影像频谱仪发现的，是三种含水矿物中最年轻的一种。
These opaline silicates were detected by MRO's Compact Reconnaissance Imaging Spectrometer for Mars and are the youngest of the three types of hydrated minerals.
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