to investigate the origin of sth

• wǒmensùyuánlezhègewèntí.

  我们溯源了这个问题。🔊

  We traced the origin of this problem.

to trace a river upstream back to its source

• wǒmensùyuánzhètiáohé.

  我们溯源这条河。🔊

  We traced the source of this river.

to investigate the origin of sth

• wǒmensùyuánlezhègewèntí.

  我们溯源了这个问题。🔊

  We traced the origin of this problem.

to trace a river upstream back to its source

• wǒmensùyuánzhètiáohé.

  我们溯源这条河。🔊

  We traced the source of this river.