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[00:00.00]Chapter 9 Database Management System [00:03.07]第九章 数据库管理系统 [00:06.14]Dialogue 1 [00:07.82]句型1 [00:09.51]A:Hey ,Greg , Check out my new wallpaper! [00:12.43]嘿,Greg,看一下我屏幕的新背景画面! [00:15.
Fade - This is a reduction in the received signal. It is caused by absorption, refraction, or reflection. Fax - This is a shortening of Facsimile, and it refers to one fax machine sending a digital re
Email - This is electronic-mail, that is text messages that are sent over the internet. Emoticons - This is a contraction meaning emotional icon that is made with common characters, such as :-) being
This is Scientific Americans 60-Second Science. Im Christopher Intagliata. Got a minute? Theres one message waiting for you. Imagine that you wanna send a secret message to your colleague at the CIA. You can encrypt it to prevent counterspies from re
Imagine that you want to send a secret message to your colleague at the CIA. You can encrypt it to prevent counterspies from reading it. But they'll still know you were sending some sort of message. There's a better optionsteganographywhich means hid
A media watchdog says who want to identify rioters in London and other cities through their smartphones. Reporters Without Borders said Blackberry has already provided Scotland Yard with information about a number of Blackberry users. British rioters