trimmer
柯林斯词典
1. N a beam in a floor or roof structure attached to truncated joists in order to leave an opening for a staircase, chimney, etc 托梁 (Also called trimmer joist)
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1. N a beam in a floor or roof structure attached to truncated joists in order to leave an opening for a staircase, chimney, etc 托梁 (Also called trimmer joist)