英汉词典

1. 偶尔的；间或的；有时发生的
    Occasional means happening sometimes, but not regularly or often.

occasional是什么意思

    e.g. I've had occasional mild headaches all my life...
           间或发作的轻微头疼困扰了我一辈子。
    e.g. Esther used to visit him for the occasional days and weekends.
           埃丝特过去会偶尔在周末或别的日子来探望他。