以下为句子列表：
英文: It has been proved that hereditary basis can be improved to create new varieties by different ways or methods such as introducing overseas germplasm resources to transduce into wild species, mutagenic breeding, space breeding, biotechnology breeding, etc.
中文: 实践证明，通过引进国外种质资源并导入野生种质、诱变育种、航天育种、生物技术育种等途径方法，能拓宽遗传基础，创造不同类型新品种，使甜菜育种工作上一新台阶。
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英文: Recently, the Sugar beet varieties bred in China are limited in hereditary basis and genetic variation genealogy.
中文: 摘要目前我国甜菜育成品种存在变异系谱和遗传基础狭窄的局限性。
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