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paper-making skill
printing
compass
gunpowder
Do you know the four great inventions of
ancient China?
/'k?mp?s/
/'g?npaud?(r)/
Guess what the invention is.
（猜词游戏：先听描述，以抢答形式用英语说出所描述的物体）
Warming up
This invention can help people do some
washing.
It is helpful for housewives.
It needs water to wash something in it.
Washing
machine
What is it?
This invention looks like a bird.
It’s made of metal. (金属）
It makes it possible for people to fly to
different places in the world.
What is it?
plane
This invention can help people in the street.
It looks like a tree standing beside the street.
It uses colored lights. Red means stopping,
green means going.
What is it?
traffic lights