Passing Josh's room, he noticed the glow coming from the fish tank, heard the aerator bubbling softly.

A golden samovar bubbling softly in the corner: flower-scented tea.

The boiler bubbled softly, puffing out odoriferous wisps into the already highly charged atmosphere.

An oil pot bubbled softly and sent up its acrid, stinging reek.

The yacht's diesel engine was already running, the exhausts bubbling softly under the stern.

The surface of the pool seethed and bubbled softly, and the steam smelled strongly of sulphur.

Fountains bubbled softly behind him, and a desert breeze rippled through palm trees overhead.

The thick millet beer bubbled softly and the cuts of beef each had a thick rind of yellow fat.

An enormous pot bubbled softly over the stove, emitting a fragrant steam.

The engine of the police boat had been started up and its exhaust bubbled softly.