subject to rapid pressure fluctuation

例句：

1. 3.
   法律等的
2. 1. The teacher asked the students to submit their homework before class.
   老师要求学生们在课前提交作业。
3. 2. This is a subject that we need to study in school.
   这是我们在学校需要学习的一个科目。
4. 3. The project is subject to approval by the supervisor.
   这个项目需要得到主管的批准。