on-line unit

例句：

1. 1. The on-line unit isdesigned to help students learn English in afun and interactive way.
   这个在线单元旨在以有趣和互动的方式帮助学生学习英语。
2. 2.The on-line unit covers all thebasic grammar rules for beginners.
   这个在线单元涵盖了初学者的所有基本语法规则。
3. 3. The on-line unit has been well received byboth teachers and students.
   这个在线单元受到了老师和学生的广泛欢迎。