英语听力精选进阶版 13281

（单词翻译）

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