传统的度免疫模型有一定的盲目性，没有考虑感染节点的位置，对整个网络中度高的节点进行免疫。
Traditional intentional immunization based on degree does not take the positions of infected nodes into account, but just protects the nodes which have high degree.
医药行业有着高技术、高投入、高风险、高回报等特点，产业集中度高，我国医药企业更是并购的多发地带。
The pharmaceutical trade has such characters as high technology, high investment and high industry concentration degree, etc.
因为较高的集中度和新进入者的高障碍使得公司间缺乏竞争。
Competition among firms is stifled, with very high levels of concentration and high barriers to new entrants.
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