1·The initial symptoms of rabies are fever and often pain or an unusual or unexplained tingling, pricking or burning sensation (paraesthesia) at the wound site.
狂犬病最初症状是发热，伤口部位常有疼痛或有异常或原因不明的颤痛、刺痛或灼痛感(感觉异常)。
2·The analysis found a significant association between sudden unexplained death and the use of a stimulant at the time of death.
研究分析发现死时在原因不明的猝死和兴奋剂的使用上存在显著相关。
3·The crash is unexplained by the discipline of economics.
飞机坠毁原因不明，是由经济学的学科。
4·Unexplained mood changes, especially feeling apathetic or irritable, can be a sign that your body isn't getting the energy it needs.
原因不明的情绪变化，特别是感觉精神萎靡或烦躁，可能预示着你的身体没有得到它所需要的能量。
5·Objective: To investigate the changes of T lymphocytes sub-types in unexplained recurrent spontaneous abortion women before and after initiative immunotherapy and passive immunotherapy.
目的：探讨原因不明习惯性流产患者外周血T淋巴细胞亚群在主动和被动免疫治疗前后的变化。
1·There had been several sudden and unexplained deaths, not only among the grown-ups, but even among children.
在成年人中，甚至在孩子们中，曾经发生了几起突然而莫名其妙的死亡。
2·Some researchers, in fact, contend that as many as 80 percent of "unexplained" pregnancy losses may be due to the immune system.
实际上，一些研究人员认为，多达80呢的“莫名其妙的”流产也许是免疫系统惹的祸。