world-asia-china-67341196 Chinese people have expressed alarm online after a second gymnasium collapsed in Heilongjiang province in months, killing three people. The three victims are middle school students, state news agency Xinhua reports. The cave-in on Monday night came after days of unseasonably cold weather and snowfall. 黑龙江省几个月内第二座体育馆倒塌，造成三人死亡，中国民众在网上表达了警惕。 据官方通讯社新华社报道，三名受害者是中学生。 周一晚上的塌陷是在连续几天反常的寒冷天气和降雪之后发生的。