单词	dogtooth spar
释义	dogtooth spar noun : a variety of calcite that occurs in acute crystals resembling the tooth of a dog Word History First Known Use 1728, in the meaning defined above
随便看	optatively optatives opted opted (for) opted for opted in opted out optezes optezzes optic optic axis optic capsule optic chiasma optic cup optic disc optic discs optic disk optic disks optic lobe optic nerve optic orientation optic placode optic rod optic sign optic vesicle

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