美国科学60秒 SSS 2012-11-06_在线英语听力室_免费在线英语听力学习网站

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Getting out grandma’s good [flat work] for the holidays? Then you’re probably dreading¹ the time it takes to polish up that silver.

Now imagine you’re in charge of the silver collection at the metropolitan² museum of art. Fortunately, for art conservators everywhere, scientists are hard to work on the process that may help keep silver shining and with a lot less elbow grease.

Researchers at the University of Maryland college park, together with the [Waltras] Art Museum in Baltimore, are using nanotechnology to prevent that nasty sulfite tarnish³ from forming. The method called atomic-level deposition⁴ coats silver objects with a protective [orksite] film in layers just a single atom thick. Researchers discussed it at the recent 2012 AVS International Symposium⁵, witch covers materials, interfaces⁶ and processing.

The technique is still being worked out and hasn’t yet been used on priceless works of art. But researchers say that it offers a number of advantages over current methods. For one thing, conventional polishing can actually remove underlying⁷ silver.

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1 dreading
v.害怕，恐惧，担心( dread的现在分词 )
参考例句：
She was dreading having to broach the subject of money to her father. 她正在为不得不向父亲提出钱的事犯愁。 This was the moment he had been dreading. 这是他一直最担心的时刻。

2 metropolitan
adj.大城市的，大都会的
参考例句：
Metropolitan buildings become taller than ever.大城市的建筑变得比以前更高。 Metropolitan residents are used to fast rhythm.大都市的居民习惯于快节奏。

3 tarnish
n.晦暗，污点；vt.使失去光泽；玷污
参考例句：
The affair could tarnish the reputation of the prime minister.这一事件可能有损首相的名誉。 Stainless steel products won't tarnish.不锈钢产品不会失去光泽。

4 deposition
n.免职，罢官；作证；沉淀；沉淀物
参考例句：
It was this issue which led to the deposition of the king.正是这件事导致了国王被废黜。 This leads to calcium deposition in the blood-vessels.这导致钙在血管中沉积。

5 symposium
n.讨论会，专题报告会；专题论文集
参考例句：
What have you learned from the symposium?你参加了这次科学讨论会有什么体会？ The specialists and scholars present at the symposium come from all corners of the country.出席研讨会的专家学者们来自全国各地。

6 interfaces
界面( interface的名词复数 )；接口（连接两装置的电路，可使数据从一种代码转换成另一种代码）；交界；联系
参考例句：
If the class needs to be reprogrammed, new interfaces are created. 如果class需要重新程序设计，新的interfaces创建。 Interfaces solve this problem of evolving code. Interfaces解决了代码升级的问题。

7 underlying
adj.在下面的，含蓄的，潜在的
参考例句：
The underlying theme of the novel is very serious.小说隐含的主题是十分严肃的。 This word has its underlying meaning.这个单词有它潜在的含义。