Like most cancers, it is thought to begin in a single cell, with a mutation that is not present at birth but that occurs later for some unknown reason.
我们认为该病与大多数癌症一样，是起源于单个细胞突变，但这种突变并不是先天的，而是发生于后天，但原因不明确。
Methods The level of expression of CD44 in 41 unknown reason infertility and 35 normal endometrium was measured by immunohistochemical method (S-P technique).
方法：采用免疫组化s - P法检测41例不明原因不孕症及35例正常宫内膜组织中CD 44的表达水平及分布。
The patient of convulsion with unknown reason, and no fever, should be checked the blood-lead for early diagnosis in order to prevent from leaking diagnosis.
对不明原因的无热惊厥者应注意及时行血铅检查，以便早期诊断，防止漏诊。
Kawasaki disease is now a major reason for acquired heart disease in children, but its etiology and pathophysiological mechanism are unknown.
川崎病是目前儿童后天性心脏病的主要病因之一，但是其病因不明，临床研究其发病机制存在诸多限制。
The reason for building the pyramids in Egypt is still unknown even today.
建造埃及金字塔的原因迄今仍不为人知。
The reason for building the pyramids in Egypt is still unknown even today.
建造埃及金字塔的原因迄今仍不为人知。
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