So, these memory cells are a way that your immune system keeps track of antigens that it's been exposed to for even if maybe the plasma cells that were producing antibody in response to the initial exposure have died and disappeared.

所以,这些记忆细胞,是人体免疫系统记忆抗原的一种方法,即使由浆细胞产生的抗体,在初次免疫应答中全部被消灭,记忆细胞仍然能迅速分化为抗体分泌细胞

耶鲁公开课 - 生物医学工程探索课程节选

Stateless devices were cheaper and simpler to create, requiring less memory and processing to keep track of things.

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They've held "Vigils Against Violence" the last Sunday of every month and maintain justice4jenna.org, a Web site devoted to her memory and to the effort to track down her killer.

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"Within the living memory of all of us, Republicans were on track to become a permanent majority, " he said in a statement.

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