cross-breeding improvement
cross-breeding improvement
杂交改良
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The infertility of cattle-yak, which is the hybrid offspring of cattle and yak, is a difficult problem in cross-breeding and improvement of yak.
黄牛和牦牛远缘杂交后代犏牛雄性不育是牦牛杂交改良中的一大难题。
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