The headstock piece ball valve is a spherical hole, around the axis perpendicular to the channel rotation, so as to achieve the purpose of crossing gate.

Jim and Ellen walking down the path with mama at the door, waving like a mother, waiting until they are beyond the gate, forever worrying about crossing roads and unsuspected illnesses.

Enter the gate Entering the gate, a cool oncoming wind crossing the hall makes me feel cool and fresh in this hot summer. The hall is wide and quiet.