对比实验研究表明：声强、辐照时间和频率是影响破乳脱水率的主要因素，而实验温度、工作方式、沉降时间等为次要因素。
The contrasting results show that sound intensity, radiation time and frequency are the main factors, and the secondary factors are test temperature, working mode and settlement time.
电针频率的改变虽然为单因素中的次要因子，但是其改变对疗效的影响仍然明显；
The therapy of venesection had conspicuous effect. Although frequency of electric acupuncture was the secondary factor, the effect was still conspicuous.
同样，对于一周只去一次健身房或者健身频率更低的人来说，办一张健身房的会员卡可能比去一次付一次要花费更多。 。
Similarly, , tempting gym membership subscriptions can work out to be much more costly than pay-as-you-go schemes for those who only visit once a week or less.
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