然而，当早期的人类第一次开始反思周围事物的本质，他们发现只是为了让思维保持有序也需要有数字的概念。
However, when early humans first began to reflect on the nature of things around them, they discovered that they needed an idea of number simply to keep their thoughts in order.
一对一对话中“反思聆听”或“积极聆听”这样的概念大家应该都比较熟悉。
You may be familiar with the concept of "reflective listening" or "active listening" in one-on-one conversation.
通过对汶川地震的建筑结构的反思，分析总结“概念设计”的重要性。
This paper reflects the building structure of earthquake in Wenehuan and analyses the importance of concept design.
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