1. Due to the marginal nature of coal heat characteristic research and the complexity of coal spontaneous combustion, the study on temperature field of coal spontaneous combustion is little. 由于煤的热特性研究属于边缘科学，加上煤自燃本身的复杂性，因此，目前对于煤自燃过程温度场研究很少。
2. This thesis introduce current situation of domestic and international in spontaneous combustion tendency and spontaneous combustion period of coal at present at first. 本论文首先介绍了一下目前国内外在煤的自燃倾向性及自然发火期的研究现状。
3. Immunological factor is a main factor in recurrent early spontaneous abortion. The immunological factor becomes significantly important as the times of spontaneous abortion increasing. 免疫因素异常在早期反复自然流产的发生中占重要地位，而且随着流产次数的增多，其在发病因素中占有的比重显著增加。
4. The reaction of coal spontaneous combustion to produce ethylene is a spontaneous reaction judging by the reaction activation energy. 由反应活化能可知，生成乙烯的反应是一个自发式反应。
5. So, the investigation depth of spontaneous potential logging is the depth of mud invasion, and relation between spontaneous potential and mud invasion depth may be built. 因此，可以得出自然电位测井的探测深度就是泥浆侵入深度，并可建立自然电位与泥浆侵入深度之间的关系。
可可英语 - 划词释义
