• 1. one fiftieth: 五十分之一
• 2. one hundred and fiftieth: 第一百五十

• 1.According to my rough statistics, some commodities take up only one tenth, one twentieth or even one fiftieth of the space in the huge package.
  据我粗略的统计，有的商品在大包装中仅占空间十分之一，二十分之一，甚至五十分之一。
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• 2.Since the silicon material is an expensive component of a conventional solar cell, a cell that requires just one-fiftieth of the amount of this semiconductor will be much cheaper to produce.
  由于硅材料是传统太阳能电池中一种很昂贵的成分，所以一种只需要1/50这种半导体材料的太阳能电池投入生产将更加便宜。
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• 3.The last one was added in 1959 when Hawaii became the fiftieth state of the United States of America.
  最后一颗星是在1959年夏威夷成为美国第五十个州时加上去的。
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