The word 'periodic' describes something that occurs at regular intervals. It can also mean happening or appearing at intervals.
单词'periodic'的意思是“周期的”、“定期的”，也指“回归的”或“间歇的，时而发生的”。
| 单词 | periodic |
|---|---|
| 音标 | [ˌpɪəriˈɒdɪk] [ˌpɪriˈɑ:dɪk] |
| 释义 | adj.["周期的","定期的","回归的","间歇的，时而发生的"] |
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