compulsory debt的用法和樣例：
例句
- Spreads on Italian and Greek debt over German bunds have widened sharply.
義大利和希臘債券對德國聯邦政府公債之間的利差急劇加大了。 - We need to further reduce our ratio of public debt to GDP to give us the flexibility to meet the demands of our aging population.
我們需要進一步降低公債佔國內生產總值的比率，亦帶來更多的靈活性，來滿足人口老齡化的要求。
