单循环- unicyclic,single-cycle, monocycle.这三个都可以，取决于你自己的嗜好
双循环-bicirculating
循环积分 circulatory integral
单淘汰 single elimination
双淘汰 double elimination
抽签 draw lots……或draw +名词，如：draw numbers 抽数字.看你抽的是什么，英语词结构和中文不完全一样.
下面这个段落里有乒乓球的几个术语，不知道你的英语程度如何，需不需要翻译，我觉得这段不是很难，你应该可以理解The game takes place on a hard table divided by a net. Players must allow a ball played towards them only one bounce on their side of the table and must return it so that it bounces on the opponents' side. If the ball doesn't land on the opponent side, it is a "dead ball", unless the receiving player has hit the ball before it has clearly passed the end line of the table. Play is fast and demands quick reactions. A skilled player can impart spin to the ball, which makes its bounce and reaction on the opponent paddle or racket difficult to predict or return with confidence.
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