边桁双层底)侧桁材双层底内的)旁纵桁的英文

side girder

• 边:    side; section
• 桁:    purlin
• 双层:    double-deck; havin ...
• 底:    bottom; base
• 侧:    slant; sloping
• 材:    timber
• 内:    inner; inside; wit ...
• 的:    4次方是 The fourth po ...
• 旁:    side
• 纵:    release; set free; ...