2 sentences for 详 (xiáng — to know)

1. 他的名字和年龄不详。

   tā de míng​zi hé nián​líng bù​xiáng.

   His name and age are not known.

   Source: CCMatrix

2. 这本书的作者不详。

   zhè běn shū de zuò​zhě​bù​xiáng.

   The author of this book is not known.

   Source: CCMatrix