◎ 兩回事 liǎng huí shì
[two entirely different things;two different matters;horse of another (different) color] 指彼此無關的兩種事物。也說“兩碼事”

1.two entirely different things; two different matters

指彼此無關的兩種事物或兩樁事情。如：善意的批評跟惡意的攻擊完全是兩回事。