The variation frequency of regenerated plants increased with the time of culture.7.
再生植株变异频率也在长期继代培养过程中随着培养时间的延长而逐渐增大。
参考来源 - 棉花体细胞培养及体细胞无性系变异初探·2,447,543篇论文数据，部分数据来源于NoteExpress
Still, the mathematical models used to rank results are usually some variation of the common term-frequency/inversed document frequency model, which is well-mapped territory.
尽管如此，用于排序结果的数学模型通常是常用的 词频/倒排文档频率模型的变体，而对于这种模型，已有很好的研究基础。
Electrical characteristics may vary depending on changes in temperature and frequency. Please consider this variation when you design circuits.
设计线路板时应考虑到电容器的电性能可能随温度和频率的变化而变化。
Orthogonal Multi-Carrier Modulation(OMCM) is adopted to overcome the frequency selectivity and time variation of low-voltage power line channel.
为克服低压电力线信道的频率选择性和时变性，系统采用正交多载波方式传输信息。
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