1.   An X-ray beam passing through the hand will penetrate the flesh but be stopped by the bones.

2.   Douglas insisted the knife not be made of a material that could penetrate flesh, especially his.

3.   The scales keep the salt flavor from penetrating the flesh of the fish and also help the fish retain moisture while baking.

4.   When the fruit is peeled, the smoky nuances of the flames have penetrated the flesh, giving it a wonderful flavor.