简述常用吸入麻醉方法。

Questions for Reference:
1. Some incentive policies have been announced to lure back talented overseas students and scholars: high salaries, preferential treatment for their children’s education, etc. Are these policies an effective way to halt the brain drain
2. Will these policies destroy the fairness and equality in education, and damage the motivation of local talented people
3. Could you recommend any other method to attract overseas students to work in China