1. After May 19, strikes were occurring on a daily basis. 在5月19日以后，罢工每天都在发生。
2. It was noticed that this strange thing had been occurring every day latterly. 大家注意到，近来这种怪事天天都在发生。
3. Even more than mountainside slides of mud or snow, naturally occurring forest fires promote the survival of aspen trees. 自然发生的森林火灾甚至比山体滑坡或积雪更能促进白杨树的生长。
4. More than 90% of the human and economic losses from climate change are occurring in poor countries, according to the report. 报告指出，气候变化造成的百分之九十以上的人员和经济损失正发生在贫穷国家。
5. A new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring. 明尼苏达大学和蒙特利尔的麦吉尔大学的一项新研究着眼于这种衰退发生的区域和程度。
