illumination standard

例句：

1. 1. The city's new streetlights have greatly improved the illumination of the streets.
   城市的新街灯极大地改善了街道的照明。
2. 2.The scientist used a special device to illuminate the dark room.
   科学家使用一种特殊的装置来照亮黑暗的房间。
3. 3. The illumination standards for outdoor lighting are set by the government.
   户外照明的照明标准由政府设定。