英文谚语 "有失必有得" 的正确表达是 "There is no gain without loss" 或者 "Every gain comes with a loss"。

这个成语的意思是在生活中，每一次获得都伴随着相应的失去，反之亦然。它提醒我们，在评价得失时应该保持一种平衡和全面的视角。

例如：

有失必有得：

She realized that losing her old job was a blessing in disguise as it led her to a more fulfilling career.

有得必有失：

You can't expect to gain without any sacrifices or losses along the way.