interval /ˈintəvəl/ n. ［c］ 间隔时间、空间，课间或剧场休息时间：at short intervals 常常；at successive intervals 接二连三地The interval between two trees measures 40 feet. 两棵树之间相隔40英尺。Trains are running at 15-minute intervals. 火车每隔15分钟开一班。 at intervals 每隔一会儿，每隔一段距离：［考句］ In the advanced course students must take performance tests at monthly intervals.考生学习高深课程必须每隔一个月参加一次考核学习情况的测试。［考句］ Students or teachers can participate in excursions to lovely beaches around the island at regular intervals. 师生们能定期去环岛海滩游玩。at intervals of 每隔…时间或距离：Seeds are planted at intervals of three inches. 每隔三英寸就种一穴种子。