The underlying cause is not fully understood.
根本原因目前尚未完全清楚。
The exact causes of PMS are not fully understood.
经前综合症的确切病因尚未完全了解。
The cause of stomach cancer is still not fully understood.
事业的胃癌是还没有完全理解。
However, the mechanism for such a trend is not fully understood.
然而，这一趋势的机制目前仍未完全清楚。
The increased risks were relatively small and are not fully understood.
服用激素所增加的风险很小，而且还没有完全弄明白其机理。
But the exact molecular mechanism of PNI was not fully understood.
但胰腺癌神经浸润转移的确切分子机制至今尚不明朗。
There is a residue only when an experience is not fully understood;
只有未彻底了解经历时记忆才残存在心理上；
Though a major risk factor is obesity, the exact cause is not fully understood.
尽管打鼾的主要原因是肥胖，具体成因却一直没有被完全知晓。
China's stimulus package plan was not fully understood by the world, he said.
中国的刺激方案计划不完全地被世界理解，他说。
Up to now, the selectivity mechanism of mesosulfuron is still not fully understood.
然而，目前甲基二磺隆的选择性机理尚不清楚。
Objective The pathogenesis of essential hypertension (EH) is not fully understood as yet.
目的原发性高血压（EH）的发病机制迄今仍未完全清楚。
In particular, the role of inflammation in plaque destabilization is not fully understood.
特别是，在（粥样硬化）斑块不稳定中炎症（所起）的作用还没有完全掌握清楚。
The most common glioma is glioblastoma multiforme and the possible causes are not fully understood.
最常见的神经胶质瘤为神经胶母细胞瘤，神经胶质瘤形成的因素至今尚未完全明朗。
Target audience and their needs may not be fully understood.
目标听众和他们的需求可能不能被完全理解。
However, the full extent of the Hotmail attack is not yet fully understood.
然而Hotmail攻击的严重程度尚未被充分理解。
The genetics of depression are complex and not yet fully understood.
有关抑郁的基因研究很复杂，还没有被人们完全了解。
Perhaps his art will not be fully understood for many years.
或许在以后的很多年间，他的艺术还不会被人们所充分理解。
Perhaps his art will not be fully understood for many years.
或许在以后的很多年间，他的艺术还不会被人们所充分理解。
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