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Rebecca949 发表于 2015-9-23 09:42

VOA慢速英语2015.09.21

[audio]http://sound.yywz123.com/tingbbs/voa/voa20150921.mp3[/audio]



______________________"We genetically modify the Salmonella so that it is unable to survive in healthy tissues, but has a preferential homing (attraction) to tumors, which is a very nutrient-rich environment where they grow like crazy and, in so doing, kill the cancer cells within the tumor."________________________我们对沙门氏菌进行了基因修改使其无法在健康组织中正常生存,但是肿瘤对于这些基因来讲是一个很好的生存条件,这是一个富有营养的环境他们可以疯狂的生长,然后就可以发挥修改过基因的沙门氏菌的作用来杀死癌细胞.




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arstamman 发表于 2015-9-23 10:56

听说他们家是同质同步美国的教学体系,有一些高中可以免托福的。我们家孩子未来肯定要去美国读书的,所以选择瑞思。

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