知的

We also know there are known unknowns; that is to say we know there are some things we do not know.

我们也知道，有些已知的未知物；就是说，我们知道有些东西我们是不知道的。

We also know there are known unknowns; that is to say we know there are some things we do not know.

我们也知道还有一些已知的未知，也就是说我们知道自己还有一些不知道的事情。

There are known unknowns. That is to say, there are things that we know we don't know.

我们也知道这世上还有已知的未知，也就是说我们知道我们还不知道的那些事情。

The only son and heir of Tsar Nicholas II and Alexandra of Hesse, officially known by the title "Grand Duke and Tsarevich of Russia." He, along with his parents and sisters, was executed on July 17, 1918, a month shy of his 14th birthday, by the Bolshevik secret police.

沙皇尼古拉二世和亚历山德拉·费奥多罗芙娜唯一的儿子，也是沙皇继承人，为人所知的正式封号为&大公和俄罗斯皇储&。1918年7月17日，他和父母姐妹们被布尔什维克秘密警察处死，当时离他14岁生日仅有一个月。

In the first chapter, we introduce some relating definitions,symbols and theorems .

第一章简述一些与本文有关的定义、准则和已知的结论。

Joran van der Sloot was the last person known to have seen Holloway.

Joran van der Sloota是目前为止已知的最后一个见过Holloway的人

Joran van der Sloot was the last person known to have seen Holloway.

Joran van der Sloota是目前为止已知的最后一个见过少女的人

Joran van der Sloot was the last person known to have seen Holloway.

Joran van der Sloot是所知的最后一个看到Holloway的人。

The oldest known Feng Shui device consists of a two-sided board with astronomical sightlines.

至今所知的最古老风水设备是由一块双面的木板组成，上面带有天文视线。

Listen and Share[00:13.73]知行快报[00:15.97]双语新闻[00:23.50]European countries are increasingly pegging [00:26.45]speeding fines to income [00:28.39]as a way to punish wealthy scofflaws [00:31.35]who would otherwise ignore tickets.

欧洲国家正逐步将超速罚单与收入挂钩，[00：48.88]以此作为对那些藐视法律的富人的一种惩罚办法，[00：54.29]否则，这些有钱人会对区区罚单不以为然。

I can not make it blossom and suits me

我不能让树为我开花

When temperatures are above approximately 80 °C discolouration of the raceways or rolling elements is a frequent feature.

当温度高于 80 °C 左右时，滚道或滚动元件褪色是很常见的特征。