SYDNEY, July 11 (Xinhua) -- A woman and a child have died after a car hit a tree and caught fire northeast of Sydney. A police statement on Friday said that emergency services were called to reports ...

（法新社雪梨11日电） 研究人员今天表示，由于海洋暖化，对人类颇具危险性的公牛鲨每年在雪梨（Sydney）海滩附近徘徊的时间更长，不排除有朝一日会整年都在沿岸游荡。