It seems that there is an underlying need to keep things private and undisturbed by the other - a refusal to allow penetration.

The drainage is good and allows deep penetration of the roots.

These included shortening and some physical piercing of the walls to allow greater visual penetration of the entire structure.

For an open system, there is a wall that allows penetration by matter.

It allows more penetration than the three-man front, assuming the Jets can find the right people.

Thinning also allows more light penetration and air circulation; both important to tree health.

A forward in the high post area can also set screens on the players at the top of the zone to allow penetration by the guards.

Most condoms are lubricated and they allow less painful and easier penetration.

Keeping the eyes closed (without continued blinking) for a few minutes may allow better penetration and effectiveness of the medication.

But they do allow penetration and passage of water and water vapor.