changeovers
n.
（生产方法、装备等的）完全改变，（方针的）转变( changeover的名词复数 );
例句:
-
Sensors are also starting platforms to monitor false starts and correct relay changeovers.
在跳台上也装有感应器,以监督起跳动作和游泳接力比赛中交接棒是否规范.
-
Ferrer had the trainer on to massage his legs at several changeovers, much to Murray's annoyance.
来自BBC