In 2016. they succeeded

　　A team of British and Czech scientists, led by Dr Tomas Cizmar. say

　　they have created a rea-life "tractor beam". like the kind from Star Trek . which uses a line of

　　light to attract objects. at least at a microscopic level

　　Light control techniques have existed since the l970s. but this is thought to be the first

　　time a beam has been used to draw objects towards a light source

　　Usually when microscopic

　　objects are hit by a line of light. they are forced along the direction of the beam

　　After many

　　years' research. Dr Cizmar's team discovered a technique that allows for the radiant force(辐射力) of light to be changed and to use the negative force to draw out certain particles（小颗粒）

　　Dr Cizmar says that even though it is a few years away from practical use. the technology　 has huge potential for medical research

　　In particular. the tractor beam is highly selective in　 the particles it can attract. so it can pick up particles that have specific characteristics. such as　 size or composition. in a mixture

　　"Eventually, this could be used to separate white blood　cells. for example," Dr Cizmar told BBC News

　　It has been a primary plot design in science fiction TV programs and movies to allow objects like spaceships to be trapped in a line of light But Dr Cizmar said this particular technique would not eventually lead to that A transfer of energy happens in the process

【2016届湖南长沙市高考英语二轮阅读理解训练（54）（含答案）】相关文章：

★ 四川省广安市2014高考英语一轮基础训练题（4）及答案

★ 2014高考英语（新人教版）一轮基础训练（14）A、B卷（附答案或解析）

★ 贵州省贵阳市2014高考英语（新人教版）一轮阅读训练（13）附答案

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（20）及答案

★ 2017高考四川省广安市英语阅读理解一轮系列训练：18（含解析）

★ 2017年高考英语二轮复习精品资料：专题15 完形填空（押题专练）（原卷版）

★ 2016届湖南长沙市高考英语二轮阅读理解训练（45）（含答案）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (44)

★ 浙江省湖州市2014高考英语阅读理解一轮（暑假）精炼（5）含答案

★ 辽宁省辽阳市2014高考英语单项选择一轮（暑假）训练（1）附答案