It will never be known how and when this numeration ability developed, but it is certain that numeration was well developed by the time humans had formed even semi-permanent settlements.
我们永远也不会知道这种计算能力是何时、如何发展起来的，但可以肯定的是，在人类形成半永久定居点的时候，这种计数法已经发展得很好了。
I mean to say, you should have known how he would react!
我的意思是说，你本应料到他会作何反应！
It's still not known how many died in the volleys of gunfire.
尚不知道有多少人死于齐发的炮火中。
They have studied these books and known how to sort the rubbish.
他们学习了这些书，知道如何分类垃圾。
The uncle had known how to help himself.
叔叔知道如何自助。
It isn't actually known how many sites there are across Australia where rock art can be found—but unfortunately, we do know that much of the art is being lost to us.
目前还不知道在澳大利亚有多少地方能够发现这种岩石艺术；但不幸的是，我们知道有很多艺术作品正在消失。
She had known how sick she was.
她早已知道自己的病情有多严重了。
Have you known how sorry I am?
你知道我对你有多么抱歉吗？
But no one has known how it works.
但是没有人知道这明矾是如何奏效的。
Perhaps you have never known how to be saved.
也许你从来都不知道怎样被救赎。
It is not known how long these changes can last.
目前尚未知晓这一变化将持续多长时间。
If we had known how to help, we would have acted.
如果我们知道要如何应对，我们将立即行动。
But it is not known how much water there is on Earth.
但我们现在还不知道地球上到底有多少水。
The husband replied, "You should've known how stupid I was
“如果早知道你有这么蠢我决不会嫁给你！” 一个女人对她的丈夫喊道。
It's not known how such an inborn fear might develop, however.
然而，我们还不清楚这种的天生的恐惧是如何产生的。
How could the lady have known how much she and her husband needed it?
老太太怎么知道她和她丈夫正急需钱呢？因为孩子下个月就要出生了，生活将很艰苦。
Who could have known how popular these types of problems would turn out to be?
你知道这些问题在当时有多么流行么？
Human beings have always known how to avoid getting pregnant to some extent.
人类一直都知道，如何避免怀孕。
He would have preferred to put her idea aside altogether, if he had known how.
如果他知道怎么办的话，他真愿意把关于她的思想完全撂在一旁。
People have known how to make ethanol since the dawn of civilisation, if not before.
如果不能说在人类文明开始之前人们就学会制造乙醇，那这也是人类文明刚刚出现就有的事了。
I never would have known how valuable and fun being single was if I hadn't thought to try it.
如果我没有尝试，就永远也不知道单身是多么愉快。
Although it is not known how the blocks were put in place, several theories have been proposed.
尽管人们还无法知晓这些石块是如何巧到好处地放置的，但人们已对此提出了一些看法。
I might have known a lot, but I wouldn't have known how to express it, and how to structure it.
我也许了解很多东西，但不会懂得如何去表达它，构建它。
It's not known how many people are tracked with GPS devices every year, but the devices don't always go undetected.
没有人知道每年有多少人被GPS设备跟踪，但是这种设备有时也会被人发现。
It is not known how much of his personal fortune, which was estimated at 12.8bn in March 2008 by Forbes, had been lost.
还不能统计他个人财富的现值，但是据估计福布斯排行榜2008年8月时公布他的个人财富128亿应该已经全部不复存在。
Indeed, May has said that if he had known how massive Top Gear would become, he would not have joined in the first place.
事实上，梅曾说过要是早知道TopGear会这么火，当初就不加盟了。
Apple has sold more than 7.5 million iPads since April, the company reported, but it is not known how many went to schools.
苹果公司的报告称从四月份开始已经售出了7千5百万台iPad，但是尚不知道其中有多少进入到学校。
Apple has sold more than 7.5 million iPads since April, the company reported, but it is not known how many went to schools.
苹果公司的报告称从四月份开始已经售出了7千5百万台iPad，但是尚不知道其中有多少进入到学校。
应用推荐