首次成功英语怎么说

"首次成功"可以用英语表达为"first success"。

其中，"first" 意为 "第一个"，"success" 意为 "成功"。这两个词结合在一起表示"第一次成功"的意思。

例如：

The company's first success came with the launch of their new product. (公司的首次成功来自于新产品的推出。)
He felt a sense of accomplishment after his first success in the competition. (在竞赛中首次成功后，他感到有成就感。)
The first success is always the most memorable one. (首次成功总是最难忘的。)