我们确实也有更复杂的系统用于空间供暖，它们分为两类，被动供暖系统和主动供暖系统。
We do also have more complex systems that are used for space heating and they fall into two categories, passive and active heating systems.
根据科维的第一，人们可以被分为两类：消极被动的人和积极主动地人。
According to Covey's definition people can be classified into two generic groups: reactive people and proactive people.
简述了两类电磁装甲主动电磁装甲和反应电磁装甲的基本概念。
This paper simply introduces the idea of two electromagnetic armors:active electromagnetic armor and reactive electromagnetic armor.
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