The causes for prostate cancer are not yet fully understood . prostate cancer tends to happen in older men and is rarely found in men below the age of 50 前列腺癌的成因至今依然未明，但患者以年长男性居多，较少发生在50岁以下的男士身上。
The chief executive has expressed his concern over the tense relationship between the legislature and the executive , but he does not seem to understand the crux of the problem 特首亦曾对行政、立法议会关系趋向紧张而表示关注，但却似乎未明所以。
When i again unclosed my eyes , a loud bell was ringing ; the girls were up and dressing ; day had not yet begun to dawn , and a rushlight or two burned in the room 我再次睁开眼睛时，只听见铃声喧嚷，姑娘们已穿衣起身。天色未明，房间里燃着一两支灯心草蜡烛。
Moreoer , they add , the findings suggest that women with unexplained chest pain may need help in dealing with the psychological effects of remaining undiagnosed 另外，他们又补充说，这些发现表明有无法解释胸痛的妇女可能需要接受针对未明原因的心理问题的帮助。
A clever helmsman , therefore , must be he who avoids these dangers , and his course is even more difficult because he finds himself in unknown waters without a chart or compass 一个聪明的陀手一定会避免在没有罗盘的情况在一片未明的大海中行驶。因为它充满危险。
The cause is unknown , there could be a genetic predisposition that is triggered by an infection , for instance german measles is thought to trigger type 1 diabetes in some people 病因未明，可能有遗传学易感性，被感染诱发，例如风疹被认为可以诱发一些人得1型糖尿病。
Officials say the exact cause of a north carolina beach house fire that killed seven college students is undetermined . but improperly discarded smoking materials cannot be ruled out 北卡罗来纳州海滨别墅的大火导致了7名大学生的死亡，火灾起因未明。但不能排除易燃物的随意丢置的原因。
The cause of autoimmune diseases is not fully known or understood , however , it is suspected that hormones , heredity and environmental factors all play a major role in the cause and onset of these types of diseases 导致自我免疫系统疾病的至今原因仍然未明，荷尔蒙、先天毛病和环境可能是最主要的原因。
It is important to consult medical personnel promptly for conditions with unknown cause , and those which are serious , persisting or deteriorating . never delay proper treatment and simply rely on temporary symptomatic relief 此外，病因未明病况严重持续或转坏的情况，应尽快向医护人员查询，不要只顾暂时纾缓病徵而延误医治。
