美国科学60秒 SSS 2013-01-28_在线英语听力室_免费在线英语听力学习网站

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　　This is Scientific American 60-second Science,I'm Gretchen Cuda Kroen,got a minute?Sharing syringes is a big no-no.Despite the warnings,needles sharing among injection drug users are still a significant cause for the spread of HIV and other infectious diseases.

　　But HIV transmission due to needle sharing could nearly be eradicated¹ by merely changing the design of the syringe.So says a study in the international journal of Drug Policy.When the plunger on a syringe is fully² depressed,a small amount of fluid stays trapped in what is known as the dead space,by reducing the amount of dead space in the syringe design,researchers say they can reduce the amount of infectious blood trapped inside by a factor of 1000.And thus,vastly reduce the number of viral particles available to spread disease.

　　Using a simulation model,the authors found that switching to low-dead-space syringes would reduce annual HIV infection from Syringe sharing to nearly zero within eight years.

　　Although there are still a number of barriers to making low-dead-space syringes available worldwide,the authors say this low-cost invention could help keep drug users and their families disease free.

　　Thanks for the minute,for Scientific American 60-second Science,I'm Gretchen Cuda Kroen.

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收听单词发音

1 eradicated
画着根的
参考例句：
Polio has been virtually eradicated in Brazil. 在巴西脊髓灰质炎实际上已经根除。 The disease has been eradicated from the world. 这种疾病已在全世界得到根除。

2 fully
adv.完全地，全部地，彻底地；充分地
参考例句：
The doctor asked me to breathe in,then to breathe out fully.医生让我先吸气，然后全部呼出。 They soon became fully integrated into the local community.他们很快就完全融入了当地人的圈子。