短语词组短語thimble beam -hole 射柱孔套琯wall beam with hole 開洞牆梁beam -entry hole 束入射孔horizontal beam hole 水平射束孔道;水平射柱孔道beam hole shielding 孔道屏蔽beam hole shield 射柱孔屏蔽hole beam -entry 射柱入孔 返回 beam hole