(1)發(fā)生(take place;come into being;happen)[I]：Many accidents～in the home.許多意外事故是在家里發(fā)生的。Several murders～during the last act of the play.在戲的最后一幕中發(fā)生了好幾起謀殺事件。When did the earthquake～? 地震是什么時(shí)候發(fā)生的?〖同〗happen，befall，result;
(2)存在，出現(xiàn)，被發(fā)現(xiàn)(exist;appear;be found)[I，I+prep](fml)：Misprints～on every page.每頁(yè)上都有印刷錯(cuò)誤。Oil～s under the North Sea.北海下面發(fā)現(xiàn)了石油。Tuberculosis～s most often in damp climates.結(jié)核病多見(jiàn)于氣候潮濕地區(qū)?！纪絘ppear，arise，rise，emerge;〖反〗disappear，vanish;
(3)想到(起)(come into one's mind)[I+prep(to)]：An idea～red to him.他想起了一個(gè)主意。It～red to me to visit my parents.我想到了去看望父母。Did it ever～to you that she needs you? 你曾想到過(guò)她需要你嗎?
→oc′currence n;
【辨異】occur與happen和chance的區(qū)別見(jiàn)CHANCE。