bottom course

例句：

1. 1. The student needs totake a basic course before they can moveon to more advanced topics.
   学生需要先修读一门基础课程，才能继续学习更高级的内容。
2. 2.The teacher recommended that the studentstake a foundational course in mathematics.
   老师建议学生们先修读一门数学的入门课程。
3. 3. Many studentschoose to take a bottomcourse in order to gain asolid foundation in their chosen field.
   许多学生选择先修读一门基础课程，以便在他们的领域内打下坚实的基础。