不能征服的

例句：

1. 1. Thesoldiers were so brave that they could notbe defeated.
   士兵们如此勇敢，无法被击败。
2. 2. The dragonwas so powerful that it couldnot be destroyed.
   龙如此强大，无法被摧毁。
3. 3. The scientist's theorywas so groundbreaking that it couldnot be refuted.
   科学家的理论是如此开创性的，以至于无法反驳。