单词：periodic variation
periodic variation的用法和样例：
例句
- The mission will spend the next three-and-a-half years staring at the same stars, looking for periodic dips in brightness.任务将花费三年半时间盯住类似目标，搜索亮度周期性变化的恒星。
- The result shows that the numerical analysis method used in our study is suitable for the periodic heat transfer process.计算结果表明，对周期性变化的传热过程，采用这种数值分析方法是适宜的。
- Variations in the properties of the weld occurring at short regular intervals along the weld line due to repetitive variation in welding heat.由于焊接热量周期变化，使得沿焊缝线每一固定的小间距焊缝的性能出现周期性变化。
- Considering the effects of the outside factor and the periodic change of the predictand, the multivariate mixed threshold regression model with periodic components is developed.摘要在综合考虑预测对象的周期变化和前期外部因子的共同作用后，给出带有周期分量的多元混合门限回归模型。
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