These facts, significant but unknown, were imperceptible on the surface.
这些意味深长但不让人知的小事，表面上是未被觉察的。
But unknown to many, it has been recently discovered that it is very useful in oral care as well.
但是，许多未知的，它最近已经发现，这是非常有益的口腔护理以及。
Similarly, the numerous business concerns catering to the hobbyist have a tremendous but unknown dollar value.
同样，为满足园艺爱好者们所成立的商务公司也有着巨大而未知的经济效益。
Before Columbus, the parasites that cause malaria were rampant in Eurasia and Africa but unknown in the Americas.
在哥伦布踏上北美大陆之前，导致疟疾在欧亚大陆和非洲大陆横行泛滥的寄生虫在美洲大陆并未现身。
We consider an optimal control problem linear systems affected by external persistent disturbances with known dynamic characteristics but unknown initial conditions.
研究具有已知动态特性但未知初始条件的持续外界扰动作用下线性系统的前馈-反馈最优控制问题。
Team GB have returned from Rio with a record haul of Olympic MEDALS, but unknown to them, one last challenge awaited them when they landed at Heathrow - trying to find their luggage.
英国队以创奖牌记录的成绩从里约回国，但是他们不知道的是，当他们降落在希斯罗经常的时候，最后一个挑战在等着他们。
Mikoshi-nyudo's true identity is unknown, but in some areas, he is believed to be a shape-shifting weasel, fox or tanuki.
见越入道的真实身份仍是未知，但有些地区的人们相信他是由黄鼠狼，狐貍或貍变的。
The first two of these symbols were unknown, but Champollion knew that the repeated hieroglyphs to the far-right symbolized an "S" sound.
头两个符号是未知的，但商博良知道，在最右边重复出现的象形文字代表“S”的声音。
Psychologist Nina Strohminger at the University of Pennsylvania, who was not involved in the study, says she wants the effect to be real but cannot rule out some unknown confounding variable.
没有参与这项研究的宾夕法尼亚大学心理学家尼娜·施特罗明格指出，她希望这种影响是真实的，但不能排除一些未知的混杂变量。
She had known Max for some years now, but he was still pretty much an unknown quantity.
她现在认识马克斯也好几年了，但是他仍然是个大大的未知数。
Being rich wouldn't be bad either, but that won't happen unless an unknown relative dies suddenly in some distant land, leaving me millions of dollars.
有钱不是什么坏事，但这种情况不会发生在我身上，除非一个不知名的亲戚突然在某个遥远的国度去世了，给我留下了数百万美元的遗产。
One day, he was poisoned by an unknown plant but was saved by eating leaves of an evergreen plant.
有一天，他吃了一种不知名的植物后中毒了，但因吃了一种常绿植物的叶子而得救。
Some uses of color in nature remain unknown, but one thing is for sure, color not only makes our planet beautiful but it is also necessary for our planet to live on.
颜色在自然界的一些用途仍然未知，但有一件事是肯定的，颜色不仅使我们的星球变得美丽，也是我们的星球得以生存的必要条件。
With time you will start understanding that all those fears are just crap that your brain creates to protect you from the unknown but you’ll also know that this unknown is not THAT dangerous.
久而久之你会渐渐领悟其实所有的恐惧都是你的大脑出于保护自己的本能而产生的，而且你也会领悟到那些未知的恐惧没有你潜意识中认为的那样危险。
The ages of the other two offspring are unknown, but our source tells us both are in Australia as well.
其他两名子女的年龄未知。但我们信息来源说这俩孩子都在澳洲。
The answer is unknown, but Whitmer says researchers are planning a follow-up study to find out.
答案是未知的，但惠特默说，研究人员正计划在后续研究中找出答案。
How parental age increases autism risks remains unknown, but several hypotheses exist.
父母年龄是如何加大孤独症风险的仍是未知数，但存在一些假设。
But identifying previously unknown malware is difficult, and keeping track of different variants of existing viruses makes it harder.
不过辨认未知的恶意软件是困难的，继续了解现存各种病毒的差别将更加困难。
So the dilemma facing pregnant women is that there is a small but quantifiable risk associated with infection and an unknown but probably only very small risk associated with the vaccine.
因此，孕妇面对两难的处境，接种有不大但可以计量的与感染有关的风险，还有未知的但也许只是非常小的与疫苗有关的风险。
What she wants is unknown, but she always comes back, the spectre of darkness, the woman in black, 'the scary rhyme concludes.
虽然不知道她想要什么，但她——黑暗的幽灵，黑衣女人，总会回来的。然后，预告片在恐怖的旋律中结束。
As one example, consider a person who grew up poor and poorly educated, but became wealthy through the luck of the lottery or an inheritance from an unknown but wealthy relative.
例如，我们不妨考虑一下这样一个人，他出身贫穷，没能受过良好的教育，但通过彩票的运气或由于继承了一位无名但却有钱的亲戚的遗产而一夜暴富。
The former is any user who is casually browsing the site, but is as yet unknown to the system.
前一个角色可以是任何随意浏览站点的用户，但系统不能识别它们。
The zoo harvests bamboo on its premises and at other locations in the area, but for unknown reasons, the stands aren't regrowing normally.
动物园在园内及本地其他几个地方种有竹子，但不知怎么的，这些竹最近没有像往常那样正常生长了。
The reason for the high temperatures is unknown but thought to be related to the rapidly changing magnetic field loops that channel solar plasma.
其高温的原因至今是个未解之谜，但是人们认为这是与联通太阳的等离子体的快速变化的磁场循环有关。
But there are also unknown unknowns. There are things we don't know we don't know.
但是，还有未知的未知，那些我们不知道我们不知道的事情。
But there are also unknown unknowns. There are things we don't know we don't know.
但是，还有未知的未知，那些我们不知道我们不知道的事情。
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