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"Father said it’s because inside there’s a copper column hanging, thick at the top and thin at the bottom. Around it there are eight horizontal bars connected to dragon heads. We’re far from the epicenter, so we naturally can’t feel it, but the hanging copper column can. If it’s hit by the earthquake’s waves, the copper column will fall towards the direction of the earthquake, causing a dragon head to push out a copper ball into the mouth of a toad."
This explanation from Lin M ...
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