referencing

• Reference books may not be taken out of the reading room .
  不得将参考书携出阅览室。
• He had arrived in moscow with an outstanding reference .
  他带着极高评语来到莫斯科。
• Dr. gwynne made a simple reference to the bishop .
  格温博士向主教很简单地问了一句。
• There exists in the cosmos a preferred frame of reference .
  宇宙中有一个从优参照系。
• In addition, reference is made to the novel techniques .
  此外，还介绍了一些新的方法。
• The earth's surface itself serves as the reference space .
  地球表面即可视为基准空间。
• The velocity is with respect to a fixed frame of reference .
  此速度是相对于固定标架的。
• She has excellent references from former employers .
  她持有以前的雇主写的很好的推荐信。
• This difference arises from their frame of reference .
  这种不同来自他们相关群体的构成。