◎ 两回事 liǎng huí shì
[two entirely different things;two different matters;horse of another (different) color] 指彼此无关的两种事物。也说“两码事”

1.two entirely different things; two different matters

指彼此无关的两种事物或两桩事情。如：善意的批评跟恶意的攻击完全是两回事。