北京国家网球中心：

Ah, the Beijing National Tennis Center! It's a beautiful complex located in the Chaoyang District of Beijing, China. The center was built in 2007 for the 2008 Summer Olympics and is now a popular venue for tennis tournaments and events. The main stadium, called the Diamond Court, has a seating capacity of over 15,000 and has hosted some of the biggest names in tennis, including Rafael Nadal, Novak Djokovic, and Serena Williams. Have you ever been there?

ace网球是什么意思：

Ace网球是指在网球比赛中发球得分的一种情况。当一名球员在发球时，对方无法接到球或将球击出界，这个得分就被称为Ace。Ace通常是一种很好的发球表现，因为它可以让球员在比赛中轻松得分，而不需要进行长时间的拉锯战。