不充分的

例句：

1. 1. The teacher'sexplanation was not sufficient to answer all thestudents' questions.
   老师的讲解不足以回答所有学生的问题。
2. 2. The food was insufficient forthe amount of people present.
   食物的数量不足以满足在场的人数。
3. 3. The budget was insufficientto cover the expenses for the new project.
   预算不足以覆盖新项目的开支。