Scientists want to bring a chunk of the red planet down to Earth on what's called a sample-return mission.
科学家们希望将这颗红色星球的一大块带回地球，进行所谓的取样返回任务。
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For the first thirty miles the redearth road wound its way through the lowland forest, the giant trees standing in solid ranks alongside and their branches entwined in an archway of leaves above us.
The couple turned off Highway 56 near Modena and headed north up a dirt road into Hamblin Valley. Soon they'd entered a stark terrain of sagebrush and redearth.