This paper presents that in a language as a whole there are the clearness and the ambiguousness which are opposite to each other and united in communication.
本文提出语言整体包含清晰和模糊两个方面，这两个方面既对立又统一，共同完成交际任务。
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The complexity of the society originates from the contingency, ambiguousness and impenetrability of human consciousness and from the "double contingency"in the communication.
Comparatively, there are many deficiencies in our country's searching system, such as the arbitrariness of starting search procedure and the ambiguousness of searching with no certificate.