英语听力精选进阶版 13281（在线收听） |
Earth-orbit ‘sweeper’ proposed Vocabulary messy untidy space junk fragments of space travel leftovers that encircle the Earth a hand's breadth the width from thumb to little finger of a hand spread open manned space missions spaceships with astronauts on board threats items that could cause a collision skip move between the objects harmlessly not causing any damage orbital housekeeper device that circles the Earth and 'cleans' the area straightforward solution uncomplicated answer to the problem unusable unfit to use |
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