资料来源 : pyDict

船的桅顶横桁

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Crosstrees \Cross"trees`\ (-tr?z`), n. pl. (Naut.)
   Pieces of timber at a masthead, to which are attached the
   upper shrouds. At the head of lower masts in large vessels,
   they support a semicircular platform called the ``top.''