两回事[ liǎng huí shì ]

⒈ 指彼此无关的两种事物。也说“两码事”英two entirely different things; two different matters; horse of another (different) color;

⒈ 指彼此无关的两种事物或两桩事情。例如：善意的批评跟恶意的攻击完全是两回事。