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1.The farmer signed a heifer replacement contract with the local feed company.
农民与当地饲料公司签订了一头育肥牛的替换合同。
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2. The agreement stipulates that the heifers will be replaced by beef cattle within six months.
该协议规定，六个月内将用肉牛替换育肥牛。
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3. The contract requires that the replacement heifers must be of high quality and meet certain standards.
该合同要求替换的育肥牛必须质量上乘且符合一定标准。