per

• We beg to consign the following per s.s . ‘london' .
  请由“伦敦”号轮船运交下列各物。
• By the charge density we mean the per unit volume .
  所谓的电荷密度是指单位体积的电荷。
• Frequency is measured in hertz, or cycles per second .
  频率用赫兹即每秒钟的周数来计算。
• The velocity of light is about 300,000 kilometres per second .
  光速约为每秒30万公里。
• Meals average out at 5 per head .
  膳食平均每人。
• I hear you can't get more than six feet of cloth per man .
  我听说你们每人只能买6英尺布。
• It is two hundred yuan per month .
  每月200元。
• The fare for the descent was fixed at five dollars per head .
  地下参观的价格是每人五块美金。
• Such beds should reduce travelling distance per acre .
  这种带状栽植能减少单位面积的周转距离。
• In this area the per mu yield of wheat for an average year is 500 jin .
  这儿小麦常年亩产500斤。