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《Learning about Language》精品PPT课件优质课下载
calculating machine (1642)
analytical machine
(1822)
huge computer (1940s)
universal machine (1936)
PC
laptop
PDA
since 1970s
What do you use the computer for?
We can use the computer to search the Internet.
surf the Internet
What can we do on the Internet?
shop online
play computer games
search for information
Do they have anything in common?
They are social network!
They have something in common.
Scientists can use them to __________
____________________________.
rocket