以下为句子列表：
英文: ACTIVATING NAIVE helper T cells is the basis of vaccines for everything from pneumonia to tetanus to influenza.
中文: 不管是肺炎、破伤风或流行性感冒的疫苗，都必须先活化未曾接触过抗原的辅助者T细胞。
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英文: After two months, the rod was removed and the insulin-producing piglet cells replaced it.
中文: 两个月后，将塑料棒取出，代之以能产生胰岛素的小猪细胞。
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英文: An effective antioxidant, vitamin C helps to protect cells against free radical damage.
中文: 抗氧化剂，保护细胞免受游离基破坏。
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英文: Aspiration of the cystic lesion revealed dark-red substances without evidence of malignant cells by cytology.
中文: 囊状病灶的抽出液为暗红色物质，细胞学检查无恶性细胞。
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英文: “We worked on the theory that cells at a later stage of development might have a higher probability of success upon transplantation” says researcher Robin Ali of the University College London Institute of Ophthalmology in a news release.
中文: 尽管以前尝试使用胚胎干细胞进行视网膜移植失败了，研究人员称通过使用发育后期的干细胞，他们修复了小鼠受损的视网膜。
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