声音简介
lf you get lost in a forest,
what would you do?
ln ancient China,
over 2000 years ago,
people made the Sinan to solve this problem.
This was an early compass.
It had a spoon and a plate.
Because of Earth's magnetic field,
the spoon pointed south.
Later, as the design improved,
the spoon turned into a needle,
and this invention reached the Western world.
Interestingly, modern compasses actually point north,
so you can also call them north-pointers.
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