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A US student spent almost three days trapped inside a cave after he was left behind on a university field trip. 一名美国学生在一次大学实地考察之后落了队，被困在山洞中长达三天的时间。 Lukas Cavar, 19, was visiting the Sullivan Cave in southern Indiana with the Indiana University Caving Club. 19岁的卢卡斯·卡瓦尔和印第安纳大学探洞俱乐部于日前前往印第安纳州南部的沙利文洞里参观。 He was separated from the rest of the group who then left without him, locking the gated entrance. 他与团队中的其余人分开了，这些人在入口上锁之前便离开了。 | 
