经理论验证和实践方面考查，主要从角色的心理准备，角色的环境适应，角色的知识扩充，角色的技能完善四个方面来完成。
By the examination in theory and practice, role exchange, can be carried out when a student. has a psychological preparation, adapts to the situations, masters knowledge and skills as a teacher.
抑郁中的人们将要经历的是扩充（自我的）的一个过程，一种显露、一种做好了准备放弃过去的认同看法。
During depression you are going through an expansion process, an unfolding, a readiness to release certain agreements you made in the past.
欧盟委员会同时讨论欧盟为将来扩充成员所做的准备。
The commission also discusses the preparedness of the EU for further expansion.
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