Critics say there may be unknown risks.
评论家称，可能存在未知的风险。
The researchers think there may be unknown compounds in coffee that protect against the disease.
研究人员认为，咖啡中可能有不明物质抵御疾病。
Destination unknown may not be the case this time. But it feels just as great.
未知的目的地也许不是这次遇到的情况，但是在路上的感觉仍然非常好。
Or there may be an as yet unknown cause of some cardiovascular pathology.
也可能有某种至今未知的原因导致心血管疾病。
This procedure may not be effective on large prostates. Its long-term effectiveness is unknown.
然而，这种方法在肿块较大时可能不是那么有效，并且其长期效果至今未知。
Or there may be an as yet unknown cause of cardiovascular pathology.
亦或，存在一种至今仍不为人们所知的引发心血管疾病的病因。
You may be serving in obscurity in some small place, feeling unknown and unappreciated.
你可能在一个小地方默默奉献，无人知道无人赏识。
It may be scary because ahead lies the unknown.
它可能是可怕的，因为前途是未知的。
That important to you, and may the angels used to be so unknown.
你身边那个重要的人，也许曾经是天使也未可知呢。
The cause is unknown, but it may be mediated by the immune system.
病因不明，但可能是免疫系统介导的。
We never known there may be several unknown treasures hidden beyond the ocean waters.
我们从不知道，在海水深处隐藏着未知的财宝。
We never known there may be several unknown treasures hidden beyond the ocean waters.
我们从不知道，在海水深处隐藏着未知的财宝。
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