未被击败的

例句：

1. 1. The team has been undefeated in the last five games.
   这个队伍在过去五场比赛中保持不败。
2. 2.The players are undefeated in their league.
   这些球员在他们的联赛中保持不败。
3. 3. The team's undefeated streak is a testament to their hard work and determination.
   球队的不败纪录是他们辛勤工作和决心的证明。