But when one of them creeps close to a fly -- the usual target -- its body jerks and a gob of spit shoots out so fast the fly cannot react.

• 但是当一只喷唾型蜘蛛爬近它通常的目标苍蝇的时候，它的身体猛地一颤，一块唾沫飞速射出，速度之快使苍蝇反应不及。