?
查询技巧:
1、输入单个单词准确查询。
2、使用%模糊查询,匹配任意长度字符:
   %a    以a结尾的单词;
   ab%    以ab开头的单词;
   %ac%    含有ac的单词。
3、使用_模糊查询,匹配单个任意字符:
   _a_    三位且a在中间的单词;
   _ad    三位且ad结尾的单词;
   ac_    三位且ac开头的单词;
   _a    两位且a结尾的单词;
   a_    两位且a开头的单词。
4、带连字符-的单词,需含-字符才能模糊查询,如well-know需输入 well-% 。
5、在手机键盘上,如果g上有%和v上有_,则可长按输入。

at regular intervals
TOEFL

na. 每隔一定时间[距离]

1. 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班。
2. Check the oil at regular intervals, and have the car serviced regularly.
定期检查机油,经常保养汽车。
3. George struggled wildly, going under and resurfacing at regular intervals.
乔治疯狂地挣扎着,不断在水面上浮浮沉沉。
4. In ancient time, courier station would be established at regular intervals.
古代的时候,人们每隔一定的距离就会设定驿站。
5. It can loosely be described as travel that takes place at regular intervals—often in an annual cycle—that may involve many members of a species, and is rewarded only after a long journey.
它可以比较粗略地描述成是发生在固定周期(这个周期通常是一年一次)的包含某一个物种很多成员的集体旅行,并且只有在长途旅行后才有回报。