aperiodic

不定期的；非周期性的英释中释adjnot periodic; not occurring at regular intervals

1 Most of the sequences are aperiodic with recurrence intervals varying from a few minutes to hundreds of days..大部分相似地震的活动表现为非周期性，重复间隔从数分钟到数百天不等。

2 And it is further proved that the technique is effective and practical by means of the examples of the extraction of periodic and aperiodic signals..运用周期和非周期弱信号的检测实例，进一步证明了该方法的有效性和实用性。