Ronald seems to know all kinds of serve techniques-the backhand topspin and backspin serves,the forehand topspin and backspin serves,and the high toss serves.是什么意思_Ronald seems to know all kinds of serve techniques-the backhand topspin and backspin serves,the forehand topspin and backspin serves,and the high toss serves.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句