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NASA announced this afternoon that it plans to launch a tiny, four-pound, autonomous helicopter along with its 2020 rover mission. And if you think this sounds relatively cool, well: you're right. 今天下午美国国家航空暨太空总署(NASA)拟送微型、约四磅（3.6斤）的无人直升机完成2020年的火星探测任务，如果你觉得听起来很酷，那就对了。 The experimental, softball-sized drone would be the first airborne vehicle to fly around within Mars's atmosphere other than the landers that have delivered other, ground-based rovers. 这架垒球大小的实验无人机，不同于之前送到火星地表上探测仪，它被直接送到火星的大气层。 In order to design a flying vehicle that would actually work on another planet, NASA scientists faced a number of chanllenges. 为了使这家飞行器真正能够在火星上运行，NASA的科学家面对了一系列的挑战。 | 
