品种被改良与up连用把杂种劣种动物与纯种杂交改良与up连用级进杂种级用于动物分类
The breed is improved and used with up. The hybrid inferior animal is crossed with the pure breed. The advanced hybrid grade is used with up for animal classification
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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