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《Culture Corner》最新PPT课件优质课下载
than?5?million?years. ?During?these?
time,?many?great discoveries?in?fields?
of?science?and?technology?were?made.?
armillary sphere
seismograph
dragon-bone water lift
kite
abacus
timpani
umbrella
bronze mirror
ancient robot
suspension bridge
But do you know the four most famous inventions in ancient
China?
compass
printing press
paper making
gunpowder
纸浆
工匠
读写能力
火药
武器
指南针