The expedition members carried flares in their survival kit.探险队员们带了信号灯放在他们的救生包里。What happened to the men on the expedition will always be an unsolved mystery.这些探险队员途中如何遇险永远是个不解之谜。The explorers had to hack their way through dense jungle.探险队员得在茂密的丛林中劈路而行。