Not enough students choose science subjects in university in many countries. What are the reasons for this problem? What are the effects on the society?
主体段 1：大学生很少选择科学学科作为专业的原因 1
主体段 2：大学生很少选择科学学科作为专业的原因 2
背景句：In many countries, there aren’t enough, if not a declining number of, university students choosing science subjects as their majors.
个人观点：Several reasons could explain this situation and negative outcomes have been generated from this phenomenon.
主题句：Firstly, some of the attributes of science subjects become the natural obstacles for students to take on the path of exploring science.
举例论证: A number of science subjects, such as medicine, physics, engineering, and computer science, take a much higher tuition fee and a longer time for one to earn the degree or qualification. What’s more, the entry requirements of science subjects could be exceptionally strict, excluding a large number of applicants and potential candidates.
主题句：Another critical factor contributing to the insufficient number of science students is that many university students lack the enduring interest, passion and focus to stay committed during the academic exploration.
举例论证：Science subjects ask for a student or academic to devote a considerable amount of time, brainwork and even financial resource into scientific research. If one can’t be fully passionate with science, he or she won’t stay concentrated on doing research or contributing to the academia.
The effects of a decreasing number of students majoring in science subjects tend to be negative. For higher education, the scarcity of science students does not help training more qualified academic workers specializing in science subjects, which would impede the promotion of science education. In addition, the lack of workforce who are skilled in science would also prevent the Science and Technology industry from growing robustly, which would further negatively affect the entire national economy.
generate from 产生于，来自于
a large number of 许多，大量
concentrate on 集中于...