unwritten constitution

例句：

1. 1. The constitutionis the foundation of a country'slegal system.
   宪法是国家法律体系的基础。
2. 2. The unwritten constitution of the United States is basedon the principles of liberty and justice forall.
   美国不成文宪法基于自由和正义对所有人的基本原则。
3. 3. In some countries, theunwritten constitution is considered to be moreimportant than the written one.
   在一些国家，不成文宪法被视为比成文宪法更重要。