A bag filled with sand and used as ballast, in the formation of protective walls, or as a weapon.
装满沙土的袋子，用作压载物以筑造防护堤，或者作为武器。
Like this little vessel that would rise up to heaven were it not held down by ballast bags of sand.
就像这个小艇，如果不是由沙袋压着，它就可以升到天空。
More than a hundred years ago the city offered a bounty to ships which would bring to the port rock ballast instead of sand.
一百多年前，该城市对载运碎石而非泥土来港的船只提供奖赏。
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