“情绪不稳定”可以用英语表达为 “emotionally unstable” 或 “having unstable emotions”。以下是一些例句，帮助你更好地理解其用法：
1、 She has been emotionally unstable since the breakup.
她分手后一直情绪不稳定。
2、 People with unstable emotions may find it challenging to maintain healthy relationships.
情绪不稳定的人可能会发现维持健康的人际关系很有挑战性。
3、 He's been displaying signs of emotionally unstable behavior lately.
他最近表现出情绪不稳定的行为迹象。
4、 It's important to seek professional help if you're feeling emotionally unstable.
如果你感到情绪不稳定，寻求专业帮助是很重要的。