Cryptocurrencies are based on a special field of mathematics called cryptography. 加密货币是基于一种特殊的数学算法，称为密码学。 Cryptography is the study of how to secure communication, and it's about two really important
February 19, 2008 PRESIDENT BUSH: Well, thank you very much. Thank you; please be seated -- unless, of course, you don't have a chair. (Laughter.) Mr. President, thank you for joining us. Madam Kagame
President Bush Meets with President Compaore of Burkina Faso PRESIDENT BUSH: Mr. President, thank you for coming. I first started my conversation with the President by complimenting him on his leaders
And then our mothers tell us, Careful you don't fall down, because you'll fall over. 然后母亲告诉我们，没有跌倒也要小心，因为你还会掉下来。 Now, go into the real atmosphere of this planet. 现在，进入这个行星真正的大气层。 This planet h
