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• Average grain output per mu has reached 1,300 jin .
  平均亩产量达到了1300斤。
• Neaps are generally 20 per cent lower than average tides .
  小潮比平时低20。
• The net profit amounts to 20 dollars per ton of ore .
  每吨矿砂的净利达20美元。
• Epistaxis occurs in about 10 per cent .
  鼻出血则约占10。
• This machine runs at speed of 500 revolutions per minute .
  这台机器每分钟500转。
• A measurement capacity is 14 samples per 24 hours .
  测量的效率为24小时14个样品。
• The output per day is over 10,000 tons .
  日产过万吨。
• She got a rake-off of 5 per cent from the deal .
  她从这笔交易中获得百分之五的回扣。
• We must do everything to raise the per unit yield .
  我们要千方百计提高单位面积产量。
• The agency places about 2000 secretaries per annum .
  该代理机构每年安置约2000名秘书。