在线网校!

学习乐园-网校学习乐园

当前位置: 主页 > 外语类考试 > 托福 >

新托福阅读背景知识:霓虹灯

我们在复习备考托福阅读的过程中,多了解一些相关的背景知识,也有助于我们更好地理解原文内容。新东方在线托福网为大家整理了最新的托...

  我们在复习备考托福阅读的过程中,多了解一些相关的背景知识,也有助于我们更好地理解原文内容。新东方在线托福网为大家整理了最新的托福阅读背景知识,供大家参考。下面让我们来看看这些具体的内容吧!

【点击查看新托福阅读背景知识汇总】

  霓虹灯

  A neon light is the sort of light you see used in advertising signs. These signs are made of long, narrow glass tubes, and these tubes are often bent into all sorts of shapes. The tube of a neon light can spell out a word, for example. These tubes emit light in different colors.

  The idea behind a neon light is simple. Inside the glass tube there is a gas like neon, argon or krypton at low pressure. At both ends of the tube there are metal electrodes. When you apply a high voltage to the electrodes, the neon gas ionizes, and electrons flow through the gas. These electrons excite the neon atoms and cause them to emit light that we can see. Neon emits red light when energized in this way. Other gases emit other colors.

(责任编辑:学习乐园)
------分隔线----------------------------
热点内容
高顿网校中级会计职称课程免费领