原文：九折 八五折 八折 七五折 七折 六五折 六折 五五折 五折 四五折 四折九折 :ten percent off 八五折 :fifteen percent off 八折 :twenty percent off 七五折 :twenty-five percent off 七折 :thirty percent off 六五折 :thirty-five percent off 六折 :forty percent off 五五折 :forty-five percent off 五折 :fifty percent off; half discount 四五折 :fifty-five percent off 四折 :sixty percent off原文：90% 85% 80% 75% 70% 65% 60% 55% 50% 45% 40% 90%：ninty percent 85%：eighty-five percent 80%：eightty percent 75%：seventy-five percent 70%：seventy percent 65%：sixty-five percent 60%：sixty percent 55%：fifty-five percent 50%：fivety percent 45%：forty-five percent 40%：forty percent
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