obligatory insurance

基本解釋

First part is the generalization of the motor vehicle traffic accident obligatory insurance system.
第一部分為機動車交通事故強制保險制度概說。

Meanwhile, although federal flood insurance was both subsidised and supposedly obligatory for most mortgage holders, remarkably few people on the Gulf had federal cover: less than a fifth along Mississippi's coast and only 40% in New Orleans.
ECONOMIST: Hurricane Katrina
An alternative would be to make natural-disaster insurance (covering floods, earthquakes, avalanches and so on) obligatory, with premiums more closely reflecting the risk.
ECONOMIST: Hurricane Katrina