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自发变异
1、seasonal variation───n.季节性变动，季节性波动；季节性波动，季节性变动
2、spontaneous───adj.自发的；自然的；无意识的
3、variation margin───价格变动保证金[押金]；价格变动押金；盈亏保证金
4、unwarranted variation───无理变更
5、variation───n.变化，变更，变动；[生物]变异，变种；变奏曲
6、variation ratio───异众比率；变异比率；变速比，变速范围
7、appraiser variation───评价人变差
8、spontaneous generation───[生物]自然发生；自然发生说; 无生源说
9、variation viewer───变体查看器
1、Coal fire is a dynamic process caused by spontaneous combustion of the coal layer in various directions, accompanied by the sensible thermal field variation both in time and in space.───煤层自燃是一个动态变化的过程，随着自燃向不同方向扩大或缩小，其热场随着燃烧过程而发生空间变化。
2、Somatic mutation, a main biological phenomenon of citrus and other fruits, is often used for breeding as a major variation source. Spontaneous mutations often occur in citrus.───体细胞突变是柑橘等果树比较常见的生物学现象，也是品种选育，即芽变选种的主要变异来源。
3、Objective To study the variation of peripheral blood NK Sub-class ratio in recurrent spontaneous abortion.───目的研究自然杀伤 (N K) 细胞亚群比例变化与复发性自然流产 (R S A)的关系。