求翻译：具体任务安排如下：教学楼由初一初二学生打扫;办公楼由初三学生打扫；图书馆由高一学生打扫；理科实验室由高二学生打扫；未及时有高三学生打扫是什么意思？

Specific tasks as follows: Academic Building cleaning by the first two students; office cleaning by the third-year student; the library by a student cleaning; science laboratory cleaning by the sophomore students; not timely high school seniors cleaning

Task-specific arrangements are as follows: by teaching a beginning early cleaning 2 students early from office buildings; 3 students cleaned up; the library is made of high-school science laboratories; by cleaning 2 students cleaned up; there is no timely cleaning high 3 students

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Task-specific arrangements are as follows: students from the first second of the teaching building cleaning; office buildings by junior students to clean library by senior high school students clean; science laboratory by high school students clean; no high school students in a timely manner to clea

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