happens中文意思是v发生，碰巧
同义词是occurs，takes place ，come up
我们不能坐视这样的悲剧发生。We cannot just sit by and watch this tragedy happen.
究竟发生了什么，细节仍旧不详。
Details of what actually happened are still sketchy.
这在全国各校都正在发生。
This is happening in every school throughout the country.
