1. 复发性：部分病人可呈复发性(recurrent)或间歇性发作(stutter/intermittent),频率从ld数次到数月1次,持续时间超过2h. (共4页)

2. 反复发生的：drought 干旱 | recurrent 反复发生的 | inundate 淹没

3. 循环的：recurrence formula 递推公式 | recurrent 循环的 | recurring decimal 循环小数

4. 频频发生,重现,周期性的：recur 重现,再回到 | recurrent 频频发生,重现,周期性的 | succor 帮助,援助

1. 重现的；再次发生的
    A recurrent event or feeling happens or is experienced more than once.

    e.g. Race is a recurrent theme in the work.
           种族问题是该作品里多次出现的主题。
    e.g. ...buildings in which staff suffer recurrent illness.
           里面的员工经常生病的建筑

1. recurring again and again

    e.g. perennial efforts to stipulate the requirements

    Synonym: perennialrepeated