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Descartes
Descartes ray
Descartes' law
Descartes' rule of signs
Descartes rule of signs
Descemet's membrane
descemetitis
descemetocele
Descemets membrane
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Descartes rule of signs
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Descartes rule of signs
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[1] 笛卡尔符号法则
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Descartes rule of signs