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。
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。
Objective To study the variation of peripheral blood NK Sub-class ratio in recurrent spontaneous abortion.
目的研究自然杀伤（NK） 细胞亚群比例变化与复发性自然流产（RSA）的关系。
Objective To study the variation of peripheral blood NK Sub-class ratio in recurrent spontaneous abortion.
目的研究自然杀伤（NK） 细胞亚群比例变化与复发性自然流产（RSA）的关系。
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