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【英语时差8,16】微波炉如何加热食物?2

时间:2015-11-06 07:19来源:互联网 提供网友:yajing   字体: [ ]
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    (单词翻译:双击或拖选)

 Microwaves heat water by jerking the water molecules2 around, so to speak. Each water molecule1 has a slight positive electric charge on one side and a slight negative charge on the other. As microwaves pass by, they exert forces on those charges, first one way, then the other, several billion times per second. These back-and-forth forces turn the water molecules one way, then the other, repeatedly breaking the temporary bonds that water molecules form with each other. It’s a kind of microscopic3 stirring. The result of all this agitation4 is more violent random5 motion of all the water molecules in the food — in other words, the water gets heated. Microwaves reach all the water in the food at once, so all parts of the food are heated at once. A conventional oven heats food only from the outside, and that’s why conventional cooking takes longer than microwave cooking.


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1 molecule Y6Tzn     
n.分子,克分子
参考例句:
  • A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
  • This gives us the structural formula of the molecule.这种方式给出了分子的结构式。
2 molecules 187c25e49d45ad10b2f266c1fa7a8d49     
分子( molecule的名词复数 )
参考例句:
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
3 microscopic nDrxq     
adj.微小的,细微的,极小的,显微的
参考例句:
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
4 agitation TN0zi     
n.搅动;搅拌;鼓动,煽动
参考例句:
  • Small shopkeepers carried on a long agitation against the big department stores.小店主们长期以来一直在煽动人们反对大型百货商店。
  • These materials require constant agitation to keep them in suspension.这些药剂要经常搅动以保持悬浮状态。
5 random HT9xd     
adj.随机的;任意的;n.偶然的(或随便的)行动
参考例句:
  • The list is arranged in a random order.名单排列不分先后。
  • On random inspection the meat was found to be bad.经抽查,发现肉变质了。
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