The sight and smell of the boy's vomit triggered a chain reaction amongst the drunken youths.

The rotting smell of the monstrous meat had triggered Weeble's appetite.

The smell of "food" triggers a characteristic pattern of activity, a short-range host-seeking response.

The sight and smell of food, or even the thought of food, will trigger those cells to stimulate salivary secretion so that the mouth "waters."

The smell of her perfume or simply looking at her triggered a hunger in his groin.

The smell of her sweet blood triggered an instant response.

The smell has triggered everything from sore throats to asthma attacks to several cases of conjunctivitis, residents said.

The smell triggers your memory first.

He had forgotten how frigid the inside of the ship's "island" could be, but the smell of oiled metal triggered old memories.

As he climbed the last few meters, the smell of soot and metal triggered yet another memory from his days fighting on Bajor.