用stem against造句子，“stem against”造句

The upper stem is threaded into the diaphragm retainer nut. When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat.

When the handwheel is rotated to the closed position the upper stem pushes on the diaphragms, which deflect downward, forcing the lower stem against the valve seat.

Even through the twilight they could see that clinging to its stem against the wall was the long ivy leaf.

The day wore away, and even through the twilight they could see the lone ivy leaf clinging to its stem against the wall.