没有什么比一层油漆能更快地使房间面貌一新。
Nothing gives a room a faster facelift than a coat of paint.
使人耳目一新的是作者流畅的、谈话式的写作风格。
What is refreshing is the author's easy, conversational style.
当光波进入普通材料时，如玻璃，这些材料改变了光波中的电磁场，使光波降低到某一新的速度。
When light waves enter normal materials such as glass, the material alters the electric and magnetic fields in the light, slowing the waves to a particular new speed.
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