to ascertain

• 查明故障

  trace a fault

• 查明真相

  ascertain the truth

• 查明原因

  find out the reason

• 已彻底查明。

  Already thoroughly investigated.

• 以充分的证据查明

  show based on abundant evidence

• 查明有据的

  ascertain from the evidence

• 查明属实

  prove to be true