A transitional period is one in which things are changing from one state to another.
例句
...a transitional period following more than a decade of civil war...十多年的內戰結束之后的過渡時期We are still in the transitional stage between the old and new methods.我們仍然處于新舊方法的過渡階段。
ADJ
過渡性的;過渡時期的
Transitional is used to describe something that happens or exists during a transitional period.
例句
The main rebel groups have agreed to join in a meeting to set up a transitional government.主要叛亂集團已同意參加會議討論建立一個過渡政府。
英英詞典釋義
Adjective
1. of or relating to or characterized by transition;
"adolescence is a transitional stage between childhood and adulthood"