in a way that is not possible to be changed
不可更改, 板上钉钉
这些计划是灵活的，并不是一成不变的。
in the same situation for such a long time that it is no longer appealing
陷入一成不变的生活, 困在单调重复中
她参加了艺术课，因为日常生活已经变得一成不变。
to reach a significant stage in development and become accepted by the majority of people
走向主流, 获得广泛认可
当家庭开始彻底放弃有线电视时，流媒体走向了主流。
a complete or notable change compared to what the situation originally was
巨大变化, 根本转变
她的晋升使部门的管理方式发生了巨大变化。
someone who only tends to stay at a place, particularly a house, for a relatively short period of time before moving on to another
居无定所的人, 四处漂泊的人
作为一个居无定所的人，她只有一个行李箱和几本书。
a combination of both good things and bad things that can happen to one
起起落落, 好坏时光
他们在国外的第一年有很多起起落落。
to be passed to another owner
易主, 转手
这家公司在金融危机期间两次易主。
to allow another person to continue one's work or to take care of one's responsibilities
交接重任, 把任务交给别人
离开项目之前，他把任务交给了自己信任的人。
something that becomes so familiar to someone that it can be done without thinking
第二天性, 习惯成自然
一旦学会那些快捷键，使用它们就会成为第二天性。
to make changes to one's behavior or mindset in order to become a better and more responsible person
改过自新, 重新做人
她承诺会改过自新，不再把自己的错误归咎于别人。
to put a stop to one's habit, particularly one that is harmful or dangerous
戒掉坏习惯, 改掉坏毛病
他们开始下班后散步，好改掉整晚吃零食的习惯。
a situation or experience that involves significant ups and downs, sudden changes, or intense shifts in emotions, circumstances, or events
跌宕起伏, 大起大落
那场比赛真是跌宕起伏；我们先领先，后来落后，最后居然赢了。
to fundamentally transform something, often with far-reaching consequence
彻底改变某事, 改写某事的面貌
她的改革在不到一年里彻底改变了这所学校。
a regular or repeated change
起起伏伏, 有涨有落
每段长久的友谊都会有自然的起落。
to stay the same despite time and progress in society, technology, or culture
停留在过去, 跟不上时代
离开二十年后，他回到一个仿佛凝固在过去的小镇。
to let go of outdated practices or beliefs and embrace changes
告别旧的一套, 摒弃旧观念
他们把改革当作机会，摒弃那些拖累部门的旧习惯。
something that is changing all the time and cannot be easily predicted
变幻不定的局面, 难以预测的形势
在不断变化的危机中，她必须迅速做出决定。
(especially of prices) to increase suddenly and dramatically
暴涨, 飙升
燃油价格暴涨，许多人不再每天开车。
to experience a sudden and significant decline in one's emotional state, confidence, financial situation, etc.
暴跌, 一落千丈
银行拒绝贷款后，他的乐观情绪一下子跌到了谷底。
to not interfere with or try to improve something that is already satisfactory or functioning well
别折腾已经好好的东西, 保持现状就好
有时候，好的管理就是知道什么时候别去折腾已经运转良好的东西。
to follow the current plans, expectations, or rules, often indicating a need to adjust, cooperate, or keep up to date with others or the existing situation
跟上节奏, 配合大局
教练告诉队员们，如果想赢，就得按计划配合。
