illuminating source

例句：

1. 1. The new light bulb is much more efficient than the old one.
   这个新型灯泡比旧灯泡更高效。
2. 2.The teacher's lecture was very enlightening, helping us understand the topic better.
   老师的讲座非常启发性，帮助我们更好地理解了这个话题。
3. 3. The moonlight illuminated the path in front of us, making it easier to navigate.
   月光照亮了我们前方的路，让我们更容易导航。