at (…) intervals1with time between每隔…时间；间或；不时Buses to the city leaveat regular intervals.开往城里的公共汽车每隔一定时间发出一班。The runners started at 5-minute intervals.赛跑的人每隔 5 分钟出发一批。2with spaces between每隔…距离；间隔Flaming torches were positioned at intervals along the terrace.沿台阶间隔地插着燃烧着的火炬。 |