The greatest occurrence of coronary heart disease is in those over 65.65岁以上者是冠心病的最高发人群。For months at a time, air raids were a nightly occurrence.一度有几个月，每天晚上都会发生空袭。The occurrence of the disease is apparently related to st...

v.发生(occur 的过去分词)...

Hardseedness is a naturally occurring phenomenon for many plants, especially leguminous species.摘要硬实是植物中普遍存在的现象.Objective To assess the EKG occurring in acute barium poisoning.目的探讨急性钡中毒时心电图异常的临床意义.RESULTS: The serum albu...

occurrences的音标：occurrences的英式发音音标为：[ə'kʌrənsɪz]occurrences的美式发音音标为：[ə'kʌrənsɪz]...

occur的第三人称单数（三单）为：occurs...

occurred的音标：occurred的英式发音音标为：[ə'kɜ:d]occurred的美式发音音标为：[ə'kɜd]...