known fact編輯正在努力提供更完整的內容，建議 20 分鐘後再回來看看known factknown fact — 名詞名詞1. something that is accepted as true because it is proven or widely known1.名詞釋義已知事實something that is accepted as true because it is proven or widely known例句It is a known fact that exercise improves health.