然后，我们研究了音系单位的习得。
借助上海话的音系模型，我们从三个方面分析了上海话音系习得：区别性特征、音系单位和词层。
Based on the phonological model of the Shanghai dialect, we analyze three aspects of phonological acquisition: distinctive features, phonological units and word tier.
核心语音单位是只能区别语素音形并且不能通过规则推导出来的语音单位，是音系分析的基础。
The kernel phonemic units which can only differentiate morpheme forms and can not be derived by rules are the base for phonemic analyse.
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