luminous sign的用法和樣例：
例句
- These reactions are not luminous.
這些反應是不發(fā)光的。 - Sun is their luminous heated hot gas planet.
太陽(yáng)是自己發(fā)光發(fā)熱的熾熱的氣體星球。 - The sign of the restaurant is very big.
這家飯店的標志非常大。 - 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志。
