vary的名词是variability，意思是可变性；变化性；反复不定。
vary的第三人称单数： varies现在分词： varying过去式： varied过去分词： varied
The students' work varies considerably in quality.
学生作业的质量甚是参差不齐。
Study of spatial variability and stochastic modeling of surface soil permeability.
表层土渗透系数空间变异与随机模拟研究。
The problem of individual variability has always been difficult.
个体间的差异问题总是很难办。
The Comparison and Analysis of Heart Rate Variability in Normal Children and Adults.
95例正常儿童与成人心率变异性对照分析。
Climatic zoning for highway construction in China based on spatial variability theory.
基于空间变异理论的中国公路气候区划。
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