1 sentence for 边际 (biān​jì — boundary)

1. 他为人詹詹，说话总是不着边际。

   tā wéi​rén zhān zhān, shuō​huà zǒng​shì bù zháo biān​jì.

   He is quite verbose, and his speech is always rambling and off the mark.

   Source: Dong Chinese Dictionary