occur/əˋkɝ; əˈkɜː/v [I] occurred , occurring formal to happen or exist, especially in a particular place or situation【正式】〔尤指在特定地点或情况下〕发生: Major earthquakes like this occur very rarely. 像这样的大地震很少发生。+in/among The disease occurs mainly in young children. 这种病多发于幼儿。see box at见 HAPPEN 方框occur to sbphr v to come into someone's mind 被想起﹔浮现于脑海中: It occurred to me today that no one has told John yet. 今天我想起来还没有人告诉约翰。Did it never occur to you to phone? 你压根儿没想过要打电话吗?