Visiting the memorial is free but advance tickets for a specific time and date are required.
参观纪念馆是免费的，但需要在特定的时间和日期预定门票。
Visiting people who are unable to get out and enjoy regular social interactions isn't just a worthwhile use of your time. It gives you a chance to learn a bit about the character of your date.
去探访那些不能走到户外体验正常的社交活动的人不仅让你做了这件对社会有意义的事，另一方面你正好可以趁此机会了解你的约会对象的性格。
The meanings of four-tier structure and key technique are explained, A four-tier structure model is proposed, it is showing tier, operation logic tier, date visiting tier and database.
阐述软件设计开发的四层结构的组织形式及其关键技术，提出了一种基于。
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