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by hand 用手；手工
keep on 继续
In ancient times, people
wrote word_______.
To write one book, they
usually _________writing
for a long time.
Words and phrases
by hand
kept on
This is a ____________.
With ______ technology,
it was possible to _____
___ knowledge.
modern adj.现代的
printing press 印刷机
pass on 传递
by hand 用手；手工
keep on 继续
Words and phrases
printing press
modern
pass
on
But now a new kind
of books _________:the
________book(e-book).
It is easier for people to
buy and _____ online.
Words and phrases