以下为句子列表：
英文: 1990 First chemoprevention trial to show efficacy - vitamin A analogue against mouth and throat tumors.
中文: 1990年,首个化学预防试验显示效果-维生素A类似物预防口腔和喉肿瘤.
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英文: A good antidote is beta carotene, a form of Vitamin A found in dark green and orange vegetables.
中文: 胡萝卜素是非常好的解毒剂，其所形成的维他命在深绿色及橙色蔬菜中也都含有。
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英文: Biotechnologists have developed genetically modified rice that is fortified with beta-carotene -- which the body converts into vitamin A -- and additional iron, and they are working on other kinds of nutritionally improved crops.
中文: 生物技术专家已经培育出了含有β—胡萝卜素(身体可将之转化为维生素A)和更多铁元素的转基因水稻，目前正在研究培育其他一些增进营养成分的农作物。
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英文: Dandelions and parsley are excellent, having a positive Ca:P ratio and being particularly rich in vitamin A (14,000 i.u/100g for dandelion, 11,000 i.u/100g in the case of parsley).
中文: 蒲公英和欧芹是绝佳的食物，不仅含有正确的钙、磷比例还富含维生素A（蒲公英14，000国际单位/100克；欧芹11，000国际单位/100克）。
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英文: A comparative analysis was conducted on serum levels of ferrum (Fe), calcium (Ca), zincum (Zn), selenium (Se), vitamin A (VitA), vitamin D (VitD), vitamin B_ (VitB_ ), and parathyroid hormone (PTH) at , , and months after operation.
中文: 对比分析个月、个月,个月血清铁(Fe)、钙(Ca)、锌(Zn)、硒(Se)及维生素A(VitA)、维生素D(VitD)、维生素B(VitB)和甲状旁腺素(parathyroidhormone,PTH)的水平变化。
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