一个是

• None of the new design principles is easy or trouble-free .
  新的设计原理没有一个是简单易行，毫无麻烦的。
• Of these three possibilities the last seems the most plausible .
  在这三个可能性中，看来最后一个是最可取的。
• Many other proofs have been given but none is universally accepted .
  许多其它证明都曾提出过，但没有一个是被普遍接受的。
• One was blue, and a geologist; one was a horsewoman and smoked cigars .
  她们中间一个是女才子，地质学家；一个是女骑手，还会吸雪茄。
• Two seamen, plain jack chase and poet lemsford, are in conversation .
  两个水手正在谈话，一个是老百姓杰克蔡斯，另一个是诗人莱姆斯福特。
• One valve is the pressure-relief valve, which prevents pressure in the tank from rising too high .
  一个是减压阀，以防止油箱中的压力过高。
• So i always had two records, my official age and the one observed by my fami ly .
  这样，我的年龄就有两个记录：一个是官方的，一个是我家的。
• On separate stands in front of the shelves, were placed a beautiful feminine torso .
  书架前放着一些雕刻，各自都有座子，有一个是美丽的女人身段。
• In the majority of application, either the force field or the displacement field is imaginary .
  在多数应用中，不是力场就是位移场总有一个是虚设的。
• In the majority of applications either the force field or the displacement field is imaginary .
  在多数的应用中，不是力场就是位移场总有一个是虚设的。