at intervals

• At a given location , heavy precipitation is usually pulsing at intervals of a few hours
  雨带接近及经过的时候，风势疾劲，甚至会有狂风。
• She began to me truate regularly at 13 at intervals of 28 ~ 32 days with slight dysmenorrheal
  她于13岁开始有正常的月经，周期为28 ~ 32天，有轻度的月经痛。
• She began to menstruate regularly at 13 at intervals of 28 ~ 32 days with slight dysmenorrheal
  她于13岁开始有正常的月经，周期为28 ~ 32天，有轻度的月经痛。
• Easy pull - down system locks and heavy - duty spring system at intervals to fit a variety of projection formats
  拉下系统锁及重型弹簧系统适合不同投影形式
• The sign can be found at the entry to a one - way road , at a junction and at intervals along a one - way road
  这标志设于路口或单程路入口，及沿单程路重复竖设。
• Nearly all tv is commercial and it is very annoying to be interrupted by advertisement at intervals
  几乎所有的电视节目都是商业性的，而且不时被广告打断，十分烦人。
• Miss pross and he divided the night into two watches , and observed him at intervals from the adjoining room
  普洛丝小姐和他把夜晚分作两班，在隔壁屋里轮班观察着他。
• At intervals , while turning over the leaves of my book , i studied the aspect of that winter afternoon
  只见远方白茫茫一片云雾，近处湿漉漉一块草地和受风雨袭击的灌木。
• Schedules can run once or on a continuous basis at intervals of hours , days , weeks , or months
  计划可以只运行一次，也可以按一定的时间间隔（小时、天、周或月）持续运行。
• In the period that intervened april 1 and november 1 last year , two countries invaded each other at intervals
  在去年介于4月1日到11月1日之间，有两个国家不时地互相侵略。