occur的名词 occur的名词是occurence. occur. vi. 发生;出现;存在。 第三人称单数 occurs. 现在分词 occurring. 过去式 occurred. 过去分词 occurred. 扩展资料 例句: When exactly did the incident occur? 这一事件究竟是什么时候发生的.? These snails do not occur on low-lying coral islands. 这些蜗牛不会出现在低洼的珊瑚岛上。 Rattlesnakes occur in the warmer, drier parts of North America. 响尾蛇出现在北美温暖干燥的地区。 Nitrates are chemicals that occur naturally in water and the soil. 硝酸盐是水和土壤里天然存在的化学物质。 本文来源:https://www.wddqw.com/doc/49ee8516874769eae009581b6bd97f192279bf09.html