pinpoint          
 verb [ T ] uk/ˈpɪn.pɔɪnt/ us/ˈpɪn.pɔɪnt/
C2 准确指出,确定(位置或时间)
to find out or say the exact position in space or time of something
  It is not possible to pinpoint precisely the time of death. 准确地确定死亡时间是不可能的。 
 C2 查明;准确描述
to discover or describe the exact facts about something
  Emergency workers at the site are still unable to pinpoint the cause of the explosion. 现场的急救人员仍然无法确定爆炸的原因。 
 pinpoint       
 noun [ C ] uk/ˈpɪn.pɔɪnt/ us/ˈpɪn.pɔɪnt/
 极小的点
a very small spot of something
  a pinpoint of light 光点 
 pinpoint       
adjective [ before noun ] uk/ˈpɪn.pɔɪnt/ us/ˈpɪn.pɔɪnt/
 确切的,精确的
very exact
  The computer will calculate your position with pinpoint accuracy. 计算机能够精确地计算出你的位置。