free lower limb

例句：

1. 1. The free market economy is the most efficient way to allocate resources.
   自由市场经济是最有效的资源分配方式。
2. 2. The free trade agreement has greatly benefited both countries.
   自由贸易协定极大地促进了两国的发展。
3. 3. The free time allows me to pursue my hobbies and interests without any restrictions.
   空闲时间让我可以自由地追求我的爱好和兴趣，没有任何限制。