self-propelled garbage lighter 自航垃圾驳
Lighter garbage 垃圾驳船
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The garbage bag is lighter and only one third filled.
垃圾袋更轻，只装了三分之一。
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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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