由于与环境相关的探险旅行越来越受欢迎，各种各样的旅行现在被归类为生态旅游。
Due to the growing popularity of environmentally-related and adventure travel, various types of trips are now being classified as ecotourism.
然而，马克因各种各样的商业利益而需要四处旅行。
Mark, however, needs to travel extensively with his varied business interests.
他们为出国旅行实践了各种各样的事情，然而才意识到他们都没有有效的护照。
They practice various things for overseas travel, only to realize that none of them has a valid passport.
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