论单纯语言符号与合成语言符号的理据差异

理据性是单纯符号与合成符号的第一共同属性。但是，两类符号的理据存在差异：合成符号的理据远远比单纯符号的理据复杂。因此，有必要区分对待和探寻两类不同符号的理据。文章主张以探寻“象似造词”等方法获得单纯符号理据。而合成符号理据经常是多层次的，需要分解综合考证。此外，相对于单纯符号而言．合成符号的理据研究对加深母语的解释性和提高二语语块习得效率具有更大的现实意义。

On Motivation Differences of Pure and Poly-morphemic Linguistic Signs

The characters of pure and poly-morphemic linguistic signs are always mistakenly referred to as arbitrariness and motivation.This paper points out that motivation should be the first principle for both pure and poly-morphemic signs. However, the motivations of the two signs have some differences：motivation of poly-morphemic signs is far more complicated than that of pure signs. Therefore, different methods are proposed to explore their motivations. Methods such as seeking iconicity of word formation are proposed to explore pure sign motivation. Poly-morphemic signs need to be decomposed to explore the motivations in a synthetic way because the motivations are often multi-leveled. Besides, compared with pure signs, motivation studies of poly-morphemic signs are more practically significant to develop L1 interpretability and increase efficiency of L2 formulaic sequence acquisition.