Vacation tourism is a kind of mature product in the world.
在国际上，度假旅游已经是一种比较成熟的旅游活动。
参考来源 - 网络化：我国度假旅游的选择Nowadays, the debate on vacation model is heated.
近年来,关于我国休假制度、休假模式未来发展方向的争论日益激烈。
参考来源 - 休假模式与旅游交通对策研究M/G/1 single vacation queue with exhaustive service is the expansion of classical queuing theory,and it has been applied to many fields.
空竭服务单重休假M/G/1型排队系统是经典排队系统的推广,在许多领域有着广泛的应用。
参考来源 - 基于CPN的空竭服务单重休假M/G/1型排队系统建模与分析·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT A vacation is a period of time during which you relax and enjoy yourself away from home. 休假 [美国英语] [also 'on/from' N]
They planned a late summer vacation in Europe.
他们计划了一个夏末在欧洲的休假。
N-COUNT A vacation is a period of the year when schools, universities, and colleges are officially closed. (学校的) 假期
N-UNCOUNT If you have a particular number of days' or weeks' vacation, you do not have to go to work for that number of days or weeks. (工作中的) 假期 [美国英语]
V-I If you are vacationing in a place away from home, you are on vacation there. 度假 [美国英语]
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