transition
/trænˈzɪʃn; træn`zɪʃən/ n[C, U]
~ (from sth) (to sth) (instance of) changing from one state or condition to another 过渡; 转变; 变迁
the transition from childhood to adult life 从童年到成年的过渡阶段
a period of transition 过渡时期
His attitude underwent an abrupt transition, ie changed suddenly. 他的态度突然改变了.