barrel roof

基本解釋

A protrusion (56) forming a ridge is disposed on one of the roof of the barrel and the plunger head.
形成脊的突起（56）設(shè)在注射筒頂部和柱塞頭中的一個(gè) 上。
ip.com
A distal end of the barrel defines a roof , and an elongate tip, in fluid communication with the barrel, extends from the roof .
注射筒的遠(yuǎn)端限定出頂部和從頂部延伸并與注射筒流體連通的細(xì)長(zhǎng)尖端。
ip.com
NATO will not attack Syria militarily because Iran and Syria has a Defense Pact. Price of a Barrel of Mideastern Crude will shoot through the roof.
北約不會(huì)轟炸敘利亞的，因?yàn)閿⒗麃喓鸵晾手g有軍事合作協(xié)約，不過(guò)此事會(huì)造成中東石油的價(jià)格漲到屋頂。
blog.sina.com.cn

His new network, RipeTV, offers only short shows packed with cheap thrills--3- to 15-minute snippets of dirt bike racing, lingerie models and guys barrel-rolling off a two-story roof.
FORBES: Attention Deficit Television