A Comparative Study on the Definitions and Optimization of the Outward-Oriented Chinese Learning Dictionary APP

词典在二语学习过程中发挥着重要的工具性作用，尤其是词典对词语释义的准确性对学习者而言至关重要。文章着眼于国内外汉语学习词典APP的词语释义，从释义的准确性、周全性、实用性、简明性、释义语言的选用等几个方面对Pleco、Hanping Lite和JUZI汉语三个APP进行对比分析，研究发现JUZI汉语在释义的简明性，释义语种选用的用户优先性等方面还存在不足，建议JUZI汉语在释义方面应降低释义的难度、选用释义语言时把握好用户优先原则、加强对词的色彩义的编纂、把握好实用性原则，以便更好地为汉语学习者服务。Dictionaries play a crucial instrumental role in the process of second language learning, especially the accuracy of word definitions is of vital importance to learners. This article focuses on the word definitions of three Chinese learning dictionary apps, Pleco, Hanping Lite and JUZI Chinese, and conducts a comparative analysis from several aspects including the accuracy, comprehensiveness, practicality, conciseness of definitions and the choice of definition languages. The research finds that JUZI Chinese still has some deficiencies in the conciseness of definitions and the user priority in the choice of definition languages. It is suggested that JUZI Chinese should reduce the difficulty of definitions, adhere to the user priority principle in the choice of definition languages, strengthen the compilation of the color meanings of words, and follow the principle of practicality in order to better serve Chinese learners.