1. An early sign of tetanus, in which the jaw is locked closed because of a tonic spasm of the muscles of mastication. 
   牙关紧闭症破伤风的早期症状，由于咀嚼肌的强直性痉挛而导致牙关紧闭

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• 1. 咀嚼
  mastectomy 乳房切除术...mastication 咀嚼...masticatory 咀嚼剂
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• 2. 素炼
  混炼 milling, mixing...素炼 mastication...塑炼 plastication
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• 3. 捏炼
  mastic 乳香...mastication 捏炼...masticator 素炼机
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• 4. 咀嚼；撕捏；素炼
  mastic 胶...mastication 咀嚼；撕捏；素炼...masticator 捏和机；素炼机；搅拌机
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