The primary words of Modern Chinese are in the bottom of the vocabulary of Modern Chinese with the characteristics such as synchronic, basic, elemental and typical.

现代汉语基元词处于现代汉语词汇的底层，具有共时性、基础性、元素性、典型性等特点，与基本词、常用词虽有联系但不相同。

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Automatic extraction of Chinese basic vocabulary is the learning process.

汉语基本词汇提取是自学习的过程。

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Of Chinese vocabulary, vocabulary about time is the most basic, typical, and important. The time concept it reflects is one of the concept systems that is most closely linked with the humanity.

在汉语词汇系统中，时间词汇是最基本、最典型、最重要的组成部分之一，它所反映的时间观念也是与人类最息息相关的概念系统之一。

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