第二部分写的是，抛物方程的能控性。
The second part is the controllability of parabolic equation .
第三部分考虑了系统的精确零能控性。
Finally, we consider the exact null controllability of the system.
第二部分提出了传染性疾病防控的相关理论。
Part II presents the relevant theory of infectious disease prevention and control.
控烟措施中，有效的干预十分重要。
Effective intervention is very important to control tobacco.
控烟措施中，有效地干预十分重要。
Effective intervention is very important in tobacco control.
控烟措施中，有效地干预十分重要。
Effective intervention is very important in tobacco control.
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