a heavy metal ball secured by a chain to the leg of a prisoner to prevent escape
(用铁链将沉重金属球缚于犯人腿上以防逃跑的)球镣。
used in similes and metaphors to convey the idea that someone or something is a crippling encumbrance
[用于明喻或暗喻] 障碍;累赘
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the ball and chain of debt .债务牵累。