生理原则:
体育课:
Encouraging physical activity in the young through compulsory PE fights child obesity and contributes to forming lifelong habits of exercise.
体罚:
The actual physical damage inflicted via corporal punishment on children can be horrifying.
Some parents lose control and can injure children - even breaking bones or causing bruises.
禁烟:
There is little doubt that smoking tobacco is extremely harmful to the smoker's health.
配枪:
Routinely arming police officers allows them to defend themselves.