oceann.海洋;海量
occurvi.发生;存在;出现;想到
occurrencesn.发生的事名词occurence的复数形式.
occurrence law发生规律
occurrencearea发生面积
occurrence net出现网
occurrence mode赋存形态
Occurrence site好发部位
occurrence time事件出现时间
Occurrence type发生类型
occurrence area发生面积
Occurrence date发生期