That's what I've been always saying, that I was always using the mixed doubles especially to improve my net game and being able to return a guy's serve, 'cause then when you play someone like Serena, you are little bit more prepared for that.
这就是我一直在说的，我一直在使用混合双打，尤其是为了提高我的球技，能够回一个人的发球，因为当你和像瑟琳娜这样的人比赛时，你会为此做更多的准备。
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