unknown

• Each equation involves five unknowns .
  每个方程包括5个未知量。
• The woods were aflutter with unknown birds .
  树林里因有不知名的小鸟而有动静。
• Much of it is of unknown origin .
  其中大部分内容出处不详。
• List the given information and the unknown quantities .
  列出给定数据和未知量。
• He did it unknown to me .
  他没有让我知道就做了那件事了。
• What did you say to him in the unknown tongue ?
  你刚才用我不懂的话跟他说什么来着？
• Interlibrary lending was not unknown in the middle ages .
  中世纪已经有了馆际互借。
• His present whereabouts is unknown .
  他目前下落不明。
• The author 's dates are unknown .
  作者生卒年月不详。
• His present whereabouts is unknown .
  他去处不明。