Here is a question about this article: There are two major sports centers in Nanjing, Wutaishan Sports Center and Nanjing Olympic Sports Center. Both of these two are comprehensive sports centers, including stadium, gymnasium, natatorium, tennis court, etc. Wutaishan Sports Center was established in 1952 and it was one of the oldest and most advanced stadiums in early time of People's Republic of China.
What is the answer to this question: Both Wutaishan Sports Center and Nanjing Olympic Sports Center contain a stadium, gymnasium, natatorium, and what other facility?
tennis court