trestle
noun [ C ] uk/ˈtres.əl/ us/ˈtres.əl/
（桌子的）支架，搁凳
a supporting structure for a table, consisting of a flat piece of wood supported at each end by two pairs of sloping legs
engineering specialized（尤指铁路桥所用的）栈架，支架
a set of sloping supports holding a horizontal structure, used especially for railway bridges