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Something that is erratic does not follow a regular pattern, but happens at unexpected times or moves along in an irregular way.
unpredictable
Argentina's erratic inflation rate threatens to upset the plans.
阿根廷动荡不定的通货膨胀率很可能打乱这些计划。
雅思英语词汇收录8785个雅思英语词条，基本涵盖了全部常用雅思英语词汇的翻译及释义，是英语学习的有利工具。