off-again, on-again 不断变更
英文释义
Uncertain; fluctuating; not firmly settled. (NOTE: also, "on-again, off-again").
例句
The date of my sister's wedding was on-again, off-again because of her future husband's frequently changing work and travel schedule.
我妹妹的结婚日总在不断变更，因为她未来的丈夫不断改变工作和差旅计划。