adj.不稳定的，易变的，变化莫测的，(行为、情绪)反复无常的，易动(或倒下)的，不稳固的

The weather forecast predicts unstable atmospheric conditions for the weekend, with thunderstorms likely.
天气预报预测周末的气压不稳定，可能会有雷暴。
The stock market experienced an unstable period last week, causing investors to lose sleep.
上周股市经历了一段动荡时期，让投资者寝食难安。
The newly formed government is facing political instability due to internal disagreements.
新成立的政府因内部纷争而面临政治不稳定性。
A chemical imbalance in her brain makes her mood unstable, swinging from one extreme to another.
她大脑中的化学失衡导致她的情绪变得极不稳定，时好时坏。
The bridge construction site is considered unstable, so engineers are constantly monitoring it.
桥梁建设工地被认为存在不稳定因素，工程师们必须持续监控。
Her mental health has been unstable, which is why she's seeking professional help.
她的精神健康状况一直很不稳定，因此正在寻求专业治疗。
The economy is currently in an unstable state, causing widespread uncertainty among businesses.
当前经济处于不稳定状态，给企业带来了广泛的不确定性。
The athlete's performance was unstable throughout the competition, leading to a disappointing result.
这名运动员在比赛中的表现起伏不定，最终结果令人失望。
In times of economic instability, people tend to save more and spend less to ensure financial security.
在经济不稳定的时期，人们往往会增加储蓄，减少消费以保障财务安全。
The unstable political climate has made it difficult for foreign investors to commit long-term projects.
政治局势的动荡使得外国投资者难以进行长期投资计划。