"Become irreplaceable" 是表示成为不可替代的意思。这个短语来自英语动词 "replace"，意思是"替换"。当它加上前缀 "ir-" 时，就变成了 "irreplaceable"，意思是"不可替换的"。
下面是一些使用这个短语的例句：
His contributions to the company have made him irreplaceable. 他对公司的贡献使他不可替代。
She has become an irreplaceable member of the team. 她已成为团队中不可替代的成员。
The painting is irreplaceable because it is a one-of-a-kind masterpiece. 这幅画是不可替代的，因为它是一件独一无二的杰作。