变分数学

friction match───n.摩擦火柴

variational───adj.变化的；因变化而产生的；[生物]变异的

variationist───n.变体研究者

variationists───变化

sanitation man───垃圾清洁工；环卫工人

variation───n.变化，变更，变动；[生物]变异，变种；变奏曲

variationally───变化；变度；变奏；变差

variations───n.变奏曲，变更；[生物]变种（variation的复数形式）

exhibition match───表演赛

The math revealed that those women who received the most messages had more variation in individual ratings of her looks.───运用数学原理发现，人们对收到最多信息的女子外表评价较为不一致。

calculated several landscape indexes to present the variation characteristics of water through the theory of Tupu and reflect the relativity and math relationship of water elements.───通过多种景观指数图谱理论来表达水域的变化特点，反映水域要素的相关性和数量关系。

study found considerable variation in the math knowledge attained at different American colleges, with students at some scoring, on average, at the level of students in Botswana, the study said.───研究还指出在不同的美国高校中，学生的数学知识水平有很大的差别，在一些测试中，他们的平均水平跟来自博茨瓦纳的学生差不多。