penumbra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penumbrapenumbra — 名詞名詞1. the partly shaded outer region of a shadow cast by an opaque object1.名詞釋義半影the partly shaded outer region of a shadow cast by an opaque object例句The moon entered the penumbra of Earth's shadow.