1. Some very important discoveries have been made by this technology, especially you consider that some objects in space give off radio waves but don't emit any light. 运用这项技术后，已取得了一些非常重要的发现，尤其是考虑到太空中的一些物体会发出无线电波，但不会发出任何光。
2. Many household products give off noxious fumes. 很多家用产品散发有害气体。
3. Nearly all astronomical objects in space emit radio waves, whether nearby stars, objects in far away galaxies, they all give off radio waves. 太空中几乎所有的天体都发射无线电波，无论是附近的恒星，还是遥远星系中的天体，它们都会发射无线电波。
4. Fireflies give off flashes of light when they fly at night. 萤火虫夜间飞行时发出闪光。
5. If plastic and rubber are burnt, they'll give off poisonous gases. 要是塑料和橡胶被焚，就会放出有毒的气体。
