• 1. concept levels: 概念层次
• 2. multiple concept levels: 多概念层次

• 1.But with the number of attribute increasing and the more and more complicated concept levels, the traditional method based on the set theory becomes lower and lower efficient.
  但是实际应用环境中的数据属性维数非常多，属性概念层次也非常复杂，基于集合论的传统学习方法的效率变得越来越低。
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• 2.In fact, the interactions between service providers and consumers has many levels in which the concept of joint action applies.
  事实上，在服务提供者和消费者双方的交互中，在很多层面上都应用了联合的概念。
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• 3.The concept of profit parity disregards that there are varying levels of value and increment in demand depending on the distribution channel.
  但利润一体化的概念，忽略了分销渠道的不同会导致需求的价值水平和增长水平各异。
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