重要的事英语怎么说?

"Important thing" 的英语表达是 "important matter" 或 "important affair"。

来源： "important" 是形容词，意思是"重要的"，"matter" 和 "affair" 都是名词，分别表示 "事情" 和 "事务"。

一些英文例句及中文翻译如下：

"This is an important matter that requires our immediate attention." (这是一件需要我们立刻关注的重要事情。)
"I need to discuss an important affair with you." (我需要和你讨论一件重要事务。)
"It's important to address this matter as soon as possible." (尽早解决这件事很重要。)