1.at intervals基本含义是：断断续续，间隔；表示物体或事件之间有一定的空间或时间距离
Rain fell at intervals throughout night.
雨断断续续地下了一整夜。
She woke him for his medicines at intervals throughout the night.
整个晚上她不时叫醒他，让他吃药。
At intervals there were red warning lights.
红色警示灯一明一灭地闪着。
Kites whooshed above the beach at intervals.
风筝在沙滩上空时隐时现。
The doctor visits us at intervals.
医生不时来看我们。
Bargaining can go on the whole day, or even several days, with the customers coming and going at intervals.
讨价还价可以进行一整天，甚至进行好几天，买主则时来时往。
3.每割……时间或距离，有两种表达法：
at ……intervals
Buses to the city leave at regular intervals,
开往城里的公共汽车每隔一定时间发出一辆。
The runners started at 10-minute intervals.
赛跑的人每隔10分钟出发一批。
Meetings held at half-yearly `intervals.
每隔半年举行一次的会议。
Trains leave at hourly intervals.
火车每隔一小时发出一列。
at intervals of ……
Several red and white barriers marked the road at intervals of about a mile.
路上设有几处红白相间的路障，相互间隔约一英里。
We take a rest at intervals of two hours.
我们每隔两小时休息一次。
These cars are put at intervals of three meters.
这些车每隔三米放一辆。
The five of us fanned out at intervals of not more than fifteen feet.
我们五个人成扇形散开，彼此之间的距离不超过15英尺。
3.类似表达：
This capsule is to be taken every four hours.
这种胶囊每隔四小时服一次。
He visits his grandpapa every two weeks.
他每隔一周就去探望他祖父一次。
The grand Regency terraces of Brighton need painting every other year as the sea eats away at the stucco.
因为大海蚕食了那些灰泥，所以布莱顿的丽晶梯田每隔一年就要重新着色。
every third seat; every two hours.
每隔三个座位;每隔两个小时
The roses bloom every few days.
玫瑰每隔几天开花。
The contractions started coming every five minutes.
The treatment should be repeated every two to three hours.
这种治疗方法应该每隔两到三小时重复一次。
In its heyday, the company ran trains every fifteen minutes.
公司在最兴隆时期每隔十五分钟就开出一列火车。
The buses go every 10 minutes.
公共汽车每隔10分钟发一班车。
He ran in every five minutes to pump me about the case.
他每隔五分钟就跑来追问我这件事。
Mr Ashwell has to surrender his passport and report to the police every five days.
阿什维尔先生不得不交出他的护照，并且每隔5天到警察局报到一次。
Their food is adequate. It includes meat at least every other day, vegetables and fruit.
他们的伙食足够丰富了，有蔬菜、水果，而且至少每隔一天吃一次肉。
About once in ten years snow falls on Mexico City.
墨西哥城大约每隔十年降一次雪。
Naomi and Steve met every other week and spent hours together.
内奥米和史蒂夫每隔一周见面,见面后在一起呆几个小时。高考真题- 2019 江苏 阅读D
Take ten drops every four hours.
每隔四小时喝十滴。
The doctor went to see that patient day about.
这个医生每隔一天就去看那个病人一次。
There's a Number One bus every three minutes.
一路公共汽车每隔3分钟就有一班。