The first period first increased and then decreased.
在第一时间段，开始振幅增加，然后降低。
The frequencies of onset of adverse reactions were generally highest in the first 6 months of treatment and then the frequencies decreased over time or remained stable throughout treatment.
不良反应发生的频率通常在治疗的前6个月最高，然后随着时间降低或在整个治疗中保持稳定。
The results showed that with the increase of cleanness of the melt, the number of grain per unit volume increased at first, and then decreased.
证明随着熔体洁净度增大，单位体积中的晶粒数将先增加，然后减少。
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