occurence

例句:

• Many studies are made on the pattern of earthquake occurence in space, time and magnitude.
  对地震发生的空间, 时间和震级的图象作了许多研究.
  
• Occurence And Harm of The Gall Mite Infesting Lycium barbarum L.
  与枸杞瘤瘿螨的发生与危害>>相似的文献.
  
• All who saw the occurence thought the boy died.
  看到这事儿的都以为他肯定是挂了,但亚森却毫发无伤.
  
• It seems to me that emotional contagion must be a fairly understood occurence.
  来自SA