N-COUNT
(活动或体制的)转变，变更，过渡
A changeover is a change from one activity or system to another.
例句
He again called for a faster changeover to a market economy...
他再次呼吁加快向市场经济过渡。
Right now we are in the changeover period between autumn and winter.
眼下，我们正处于秋冬交替的时候。