名词间隔; 幕间休息; (数学)区间
1. at intervals : 不时, 相隔一定距离;
名词
4. There was an interval of five years between the two civil wars. 那两次内战之间间隔了五年。
5. In between parts of a play, there is often a interval. 在一出剧的两部分中间,常有幕间休息。