大梁,橫梁
Crossbeam \Cross"beam`\ (-b[=e]m`). n.
1. (Arch.) A girder.
2. (Naut.) A beam laid across the bitts, to which the cable
is fastened when riding at anchor.
crossbeam
n : a horizontal beam that extends across something [syn: {trave},
{traverse}, {crosspiece}]