A plain or notched, often wedge-shaped piece of wood or metal designed to hold parts of a machine or structure in place or provide a bearing surface, usually adjusted by a screw or key. 扁柱，夾條，凹字形楔一種平的或有凹的經(jīng)常是一塊楔形的木頭或金屬，用來(lái)在一定地方夾住機器或結構的各部分或提供軸承的表面，通常是由螺絲或鑰匙來(lái)調整
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