... （3）、“吆嗨吆”（号子）理论(the “ yo-he-yo” theory) 三、语言的本质特征（the design features of language） 1）任意性（arbitrariness） ...
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What are the design features of human language?
人类语言的甄别性特征是什么？
This paper deals with a general-purpose knowledge engineering language ACLIPS, its key facilities and features. The design and implementation of blackboard system in ACLIPS described in detail.
本文在全面介绍通用型知识工程语言ACLIPS的主要功能和特点的基础上，重点讨论了其黑板体系结构的设计与实现方法。
El backlight with the keyboard features: the application of light at night or dark environment relatively long time job, be able to clear a long time to language, design, the keyboard is displayed.
带el背光源的键盘特点：适用夜间或光线长时间比较黑暗的环境工作，能够长时间清晰地将文字、图案、键盘显示出来。
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