Rújīn mài de guīlínggāo dàduō yǐjing bù hán guībǎn le.
Most guilinggao sold today no longer contains any tortoise plastron.
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culture
The plastron is the flat underside of a tortoise's shell, also called 龟甲. Shang-dynasty diviners carved their questions on these plates and on ox bones, which is why the oldest Chinese writing is called 甲骨文 'shell-and-bone script'.
