| 单词 | 周期性地 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔appear〕New strains of viruses appear periodically.新菌系的细菌周期性地产生美国传统〔cycle〕To move in or as if in a cycle.循环：周期地或者好象周期性地运动美国传统〔oscillate〕To swing back and forth with a steady, uninterrupted rhythm.持续周期性地摆动：以稳定的、不间断的节奏来回摇摆美国传统〔pendulum〕The spaceship's jets were fired periodically to dampen a side-to-side pendulum motion that had developed.宇宙飞船的喷射装置周期性地喷射，以减缓飞船出现的左右摇摆现象。剑桥高阶〔periodic〕He suffers periodic mental breakdowns.他周期性地精神失常。剑桥高阶〔sunspot〕Any of the relatively cool dark spots appearing periodically in groups on the surface of the sun that are associated with strong magnetic fields.黑子：周期性地成群出现在太阳表面的温度相对较低的暗点，与强磁场有关美国传统 |
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