The sound of the food arriving, or the smell of food may trigger involuntary movement of the body or a wide mouth opening in anticipation of eating.
(The sound of the food arriving, or the smell of food; may trigger; involuntary movement of the body or a wide mouth opening in anticipation of eating)
The sound of the food arriving, or the smell of food
may trigger
involuntary movement of the body or a wide mouth opening in anticipation of eating