Testing and experiments show that directed physical trainings can effectively improve the optical adjusting functions and prevent the incidence of short sight.
通过实验比较的测试，发现体育定向锻炼能有效改善眼的调节功能，并对预防近视有积极作用。
2
When P wave incidents, The P-P wave and P-SV wave created from the same point are both functions of incidence angle, and of the media above and below the interface, Vp and Vs they are coupled.