1 sentence

1. 他原本在专注地看书，已而又抬头望向窗外，若有所思。

   tā yuán​běn zài zhuān​zhù de kàn shū, yǐ ér yòu tái​tóu wàng xiàng chuāng wài, ruò​yǒu​suǒ​sī.

   He was originally reading intently, but shortly after, he looked up out the window, lost in thought.

   Source: Dong Chinese Dictionary