放空
to relax completely; to empty one's mind; (finance) to sell short; (of a commercial vehicle) to travel empty (no cargo or passengers); to deadhead
防控
to prevent and control (e.g. the spread of a communicable disease)
放空挡
to coast along in neutral gear (in a car); (coll.) to go commando
放空炮
(lit.) to fire blank shots; (fig.) to be all talk and no action; to shoot one's mouth off; to make empty promises