Those tiny black dots are nanobots delivering a lethal blow to a cancerous cell, effectively killing it.

图中的小黑点就是给癌细胞以致命打击，有效杀死癌细胞的纳米机器人。

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Such nanobots still exist only in the realm of science fiction, of course, and it may take decades before they become practical.

当然，这样的纳米机器人现在还只存在于科学幻想领域，在它们变得实用之前要花上几十年时间。

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So, a team from the Polytechnic University of Catalonia in Barcelona, Spain, are looking at a way to use bacteria as messengers that deliver instructions to nanobots wrapped in DNA.

通过细菌信使向纳米机器人发送封装在DNA内的指令，这是西班牙加泰罗尼亚理工大学的研究人员们正在研究的方向。

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One of the most difficult tasks when developing these nanobots is creating and maintaining propulsion.

CNN: Nanobots get to the heart of the matter

"We're not going to spend shareholders' money trying to make nanobots and fuel cells, " says Joseph Cross, the CEO.

FORBES: The science of small

LONDON, England (CNN) -- A new breed of nanobots is being designed to assist doctors by going where no surgeon or technology has gone before.

CNN: Nanobots get to the heart of the matter