principal character的用法和样例：
例句
- It introduces its definition, seedtime, character, and analyzes the development and status of our country.
介绍了物流的定义和现代物流管理的发展阶段和功能要素及主要特征，并分析了我国物流的发展历程和现状。 - Carl, the main character, will have to consume food on his journey across San Andreas, and will gain weight if he eats too much.
卡尔，其主要特征，消耗粮食行程横跨圣安德列斯，并会增加体重，如果他吃太多。
