Some individuals argue that mandatory laws are indispensable to ensure that households increase their recycling efforts.

一些人认为， 强制性法律对于确保家庭增加回收力度是必不可少的。

By 1918, all states had passed mandatory education laws, which required children to attend school until they reached the age of 16.

到 1918 年，所有州都通过了强制性教育法，要求儿童在 16 岁之前必须上学。