They're going to move from a negative pole to a positive pole, so they're going to move through this gel.

它们会从负极移向正极,会通过这块凝胶板

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So the DNA is going to get spread out on this gel according to size, with the small ones going farther and the large ones not going as far.

因此DNA会根据大小,在凝胶上分散开,小的片段会快一些,大的片段不那么快

耶鲁公开课 - 生物医学工程探索课程节选