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1. Impossible to pass through or enter
2. Impossible to understand
1. Wonder Woman's shield is nearly impenetrable, deflecting bullets and resisting magical attacks.
2. Batman's mind is like an impenetrable fortress, guarding his secrets from enemies like the Riddler.
3. The impenetrable fog made it impossible for Shinchan and his friends to find their way back home.
4. Despite Doraemon's explanation, the time paradoxes in their adventures seemed impenetrable to Nobita.