短语词组短語barrel l theory 筒躰理論clip or barrel theory 筒躰實際wooden barrel theory 木桶理論;木桶原理gun barrel theory 筒躰實際lens barrel theory 筒躰實際the Wooden Barrel Theory 木桶理論New Barrel Theory 新木桶理論the barrel theory 木桶理論 返回 barrel theory