这种鱼是一种天然的返食者，会吐出食物来喂养幼鱼。

This fish is a natural ___regurgitator, spitting out food to feed its young.

这个工业设备中的回料装置可以自动将多余原料送回生产线。

The ___regurgitator in this industrial machine automatically feeds excess material back into the production line.

她不喜欢那位老师，因为他只是知识的复读机，从不鼓励学生思考。

She dislikes that teacher because he's just a ___regurgitator of knowledge, never encouraging students to think.