The rest is feed-lot confined and fed grain and corn.
2019年12月六级真题（第三套）阅读 Section B
They were confined to the university or research center where they worked.
2019年6月六级真题（第二套）听力 Section C
This type of learning is not confined to museums or institutional settings.
2015年12月六级真题（第二套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
ADJ
受限制的；被限定的
If something is confined to a particular place, it exists only in that place. If it is confined to a particular group, only members of that group have it.