NASA的工程师将科幻小说中的素材变成了现实，他们正在检查太阳帆-这中独特的推进技术最终有一天会使深空任务成为可能。
Making the stuff of science fiction into reality, NASA engineers are testing solar sails — a unique propulsion technology that one day could enable deep space missions.
他说，工程师们正在研究让小行星偏离地球的方法，方法之一是造一个巨大的帆。
He says engineers are already studying ways to move the asteroid out of Earth's path. One possible method is to create a large sail.
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