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Occasional means happening sometimes, but not regularly or often.
I've had occasional mild headaches all my life.
时不时的轻微头痛困扰了我一辈子。
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。