letter-base system

例句：

1. 1. The letter-base system is widely used in computer programming.
   字母基础系统在计算机编程中被广泛使用。
2. 2.This letter-based system makes it easy for students to learn and remember new vocabulary.
   这种字母基础系统使得学生能够轻松学习和记忆新词汇。
3. 3. The letter-based system has been proven to be more efficient than the traditional one.
   字母基础系统已被证明比传统系统更高效。