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单语范例（未经PONS编辑处理）
Originally called the outlook envelop, the patent initially anticipated using thin rice paper as the transparent material forming the window, though this material has since been replaced by clear plastics.
en.wikipedia.org However, impoverished, he was unable to obtain a patent or to market it.
en.wikipedia.org He gained the patent after the introduction of celluloid in 1856 and before the invention of viscose rayon (regenerated cellulose) in 1894.
en.wikipedia.org His second patent was on a process for purifying paraffin wax in 1876.
en.wikipedia.org Whilst learning they must catch 100,000 flies to get their patent, their conversation is overheard by several crooks across the hallway.
en.wikipedia.org