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。
It is our pleasure to rectify your spectacle frame but we shall not be responsible for any damage in case it happen due to any unknown reason .
我们非常愿意帮你矫正眼睛架，但是我们不负责由于任何不可预见的原因而造成的损坏而担负责任。
If, for some unknown reason, you find that the ROM image is not located in the RUU folder, you have to download the RUU and retry again.
如果由于一些未知的原因，您发现rom镜像不设置RUU文件夹，您必须下载RUU并且重试。
If, for some unknown reason, you find that the ROM image is not located in the RUU folder, you have to download the RUU and retry again.
如果由于一些未知的原因，您发现rom镜像不设置RUU文件夹，您必须下载RUU并且重试。“看不明白为什么意思本人是超级菜鸟，请勿见怪，麻烦各位高手指点，不甚感激！”
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 is that lawyers in the society's role is not clear, leading to the duties of a lawyer is unknown, in an embarrassing position.
究其原因在于律师在社会中的角色定位不明确，导致律师的职责不明，处于一种尴尬的境地。
While the last 2 factors are not that important keep in mind that aero rims ride harsher than box-section models (today called "double-wall" rims for some unknown reason).
而最后两个因素是不那么重要，记住，乘坐更严厉的航空轮圈比箱形截面模型（称为“双壁”的一些未知的原因轮辋今天）。
While the last 2 factors are not that important keep in mind that aero rims ride harsher than box-section models (today called "double-wall" rims for some unknown reason).
而最后两个因素是不那么重要，记住，乘坐更严厉的航空轮圈比箱形截面模型（称为“双壁”的一些未知的原因轮辋今天）。
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