Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
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The woman who ultimately discovered the superior features of agar as a growth medium and brought it to Koch’s attention was Fanny Angelina Hesse. Her foundational contribution to the nascent field of microbiology is often omitted from textbooks. In other cases, she is unflatteringly referred to as a “German housewife” or as “Frau Hesse,” or dismissed as an unnamed technician.
触屏 MacBook 的设计向来饱受争议，其中最旗帜鲜明的反对者，就是苹果公司的创始人——史蒂夫·乔布斯。