impenetrable
/ˌɪmˈpenətrəbəl/
American
- adj. 不可穿透的, 难以理解的
- Definition
- adj. impossible to pass through, understand, or affect
- Example
- The castle walls were impenetrable to every enemy attack.
- 城堡的城墙坚不可摧，任何敌人的进攻都无法突破。