line ballooning
线不断膨胀
以上为机器翻译结果，长、整句建议使用 人工翻译 。
On one side are representatives of the municipal bond community, who fret about being second in line behind unionized employees when states have to choose between paying debt interest or their ballooning retirement-benefit bills.
FORBES: Bondholders, Unions In High-Stakes Battle Over State Bankruptcy
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