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1. Heunderwent corneal transplantation to improve hisvision.
他接受了角膜移植手术以改善视力。
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2. The procedure is a complex one,requiring specialized knowledge and skills.
该过程复杂,需要专门的知识和技能。
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3. Corneal transplantation has revolutionized the treatment of blindnessin many parts of the world.
角膜移植在世界上许多地方已经使失明的治疗发生了革命性的变化。