The shepherd guides his sheep in the fields.

The Shepherd takes care of the sheep on the farm.

Shepherd's purse grows in the fields in the summer.

Shepherd's purses are herbaceous plants.

The milk was pasteurized before being bottled to ensure its purity.

The pasteurization of milk allows the destruction of harmful bacteria while preserving its nutritional qualities.

The milk needs to be pasteurized before consuming it.

You pasteurize the milk before consuming it.