luminous sign的用法和樣例：
例句
- These reactions are not luminous.
這些反應是不發光的。 - Sun is their luminous heated hot gas planet.
太陽是自己發光發熱的熾熱的氣體星球。 - The sign of the restaurant is very big.
這家飯店的標誌非常大。 - Many of those who abstain consider smoking a sign of weakness or intemperance.
許多戒煙者將吸煙視作軟弱或放縱的標誌。
