它通过选择淘汰，突然变异，基因遗传等规律产生适应环境变化的优良物种。
The better solution is selected out of a sudden mutation, the laws of genetic inheritance and other fine species to adapt to environmental changes.
对材料性能随时间变化规律和变异以及结构损伤对结构承载能力影响进行了分析。
The material property change with time and the influence of structure damage on the bearing capacity is analyzed.
同根异缀词的词义规律表现为：不同的前缀蕴涵着不同的词义，词性的变化有时会导致前缀的变异。
The semantic rules of these prefixes manifest themselves in that different prefixes have different meanings and the change of part of speech sometimes will lead to the alternation of the prefixes.
研究慢性乙型肝炎患者HBV前C区基因变异的变化规律与中医证候的相关机制。
To study mechanism of relationship HBV gene mutation in chronic hepatitis B patients with TCM syndrome.
本文将模式识别技术应用于油气化探，给出了方法的逻辑框图，剖析了一个典型实例，其结果说明运用模式识别方法获得地球化学场的基本结构及其变异特征，反映了地球化学场的变化规律。
This paper applies model distinguishing technique to geochemical exploration of oil and gas and gives the logic diagrams of the technical method with the aid of a typical example.
土壤有机碳具有高度的空间变异性，研究的尺度不同，其影响因子和变化规律也随之变化。
Soil organic carbon (SOC) was characterized by high spatial variability. Its impact factor and various rules would change in different research scales.
为探索急性心肌梗死时心率变异性指标变化规律，测定44例急性心肌梗死患者的心率变异性时域指标并与50例正常人进行对比。
To investigate characteristics of acute myocardial infarction(AMI) and heart rate variability(HRV), 44 patients with AMI and 50 healthy controls were involved in study.
为探索急性心肌梗死时心率变异性指标变化规律，测定44例急性心肌梗死患者的心率变异性时域指标并与50例正常人进行对比。
To investigate characteristics of acute myocardial infarction(AMI) and heart rate variability(HRV), 44 patients with AMI and 50 healthy controls were involved in study.
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