Aphosphoris any material that , when exposed to radiation , emits visible light .
发光材料可以是任一种当暴露在射线下可以发出可见光的物质。
Canada 's oil sands are considered unconventional fuels , and producing them emits more greenhouse gas .
加拿大油砂被认为属于非常规能源，提炼中会释放出较多的温室气体。
One engineer , solving an electronic problem on a new transformer , might inadvertently increase the heat it emits , thereby causing a problem down the road for the engineer working on its mechanical specs .
