以下为句子列表：
英文: To compare the drought and cold resistance of various cool-season grasses in Beijing, five different cultivars were treated with drought in summer and natural cold in winter.
中文: 摘要对冷季型草坪草种在夏季进行缺水处理，在冬季在自然条件下，比较其耐旱及耐寒性。
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英文: To improve cold resistance of two wheat cultivars, Jinyang 345and Jinmai 73, four treatments of immature embryo callus culture were employed.
中文: 摘要针对晋阳345和晋麦73两个定型品种存在抗寒性较差的缺点，对其幼胚愈伤组织进行了4种处理。
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