If Hebei Agricultural University recruits 500 science students in Hebei this year, then the score of the 500th (last) child (assuming 535 points) is the investment line of science in Hebei Agricultural University this year, that is, 535 points. The 500th child is likely to transfer to another school, because he files according to the batch line. If he obeys the adjustment, he will be transferred to the marginal major of Hebei Agricultural University.
Taking Hebei Agricultural University as an example, the investment line is assumed to be 535 points. Due to various circumstances, if his enrollment plan is not completed, then Hebei Agricultural University can only start the enrollment plan and continue to enroll students. If the final score of the child who is finally admitted through the collection of volunteers is 530 points, then this 530 points is his lowest admission line. At this time, the admission line is 530 points, and the investment line is 535 points. The admission line is smaller than the investment line.