不败的

例句：

1. 1.The team's unbeaten record is a testament to their skill and determination.
   该队的不败纪录证明了他们的技能和决心。
2. 2. The fortress was built to withstand any attack, making it an invincible defense.
   这座堡垒被建造来抵御任何攻击，使其成为坚不可摧的防御。
3. 3.The scientist's research has shown that some diseases are invincible to modern medicine.
   科学家的研究显示，某些疾病对现代医学来说是不可战胜的。