一个基本单元。
DNA链按每次一个基本单元的速度缓慢通过，同时沿石墨烯面加上一个电压。
A voltage is applied along the graphene surface as DNA strands are passed slowly through the slit one base at a time.
目的：将普通胃肠机进行改造，升级成数字胃肠，成为PACS的一个基本单元。
Objective to upgrade ordinary gastrointestinal machine to a digital one which can be connected to PACS.
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