So nano technology is the science of the very small. But how small is small?

所以说，纳米技术是一种研究微小物质的科学，但是，多小才算小呢？

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Nano-thin film is also a hot investigation in the field of materials science.

纳米薄膜也是材料科学的研究热点。

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Nano-thin film is also a hot investigation in the field of materials science.

纳米薄膜也是材料科学的研究热点。

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