研究判定to research and determine

• 医生研判他中毒，立刻进行洗胃灌肠急救。

  The doctor determined that he had been poisoned, and immediately carried out emergency treatment using stomach pumping and an enema.

• 有关方面将做进一步的分析研判，以确定飞机失事的真正原因。

  Further analysis, research, and judgement will be carried out in the relevant areas in order to determine the true reason behind the aircraft accident.