self-propelled garbage lighter 自航垃圾驳
lighter garbage
较轻的垃圾
以上为机器翻译结果，长、整句建议使用 人工翻译 。
MACHOs could well be white dwarfs--overturning a common belief that the dark matter would consist mainly of lighter interstellar garbage such as brown dwarfs.
ECONOMIST: The dark side of cosmology
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