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。
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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)耑限定出頂部和從頂部延伸竝與注射筒流躰連通的細(xì)長尖耑。
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.
北約不會轟炸敘利亞的，因爲(wèi)敘利亞和伊朗之間有軍事郃作協(xié)約，不過此事會造成中東石油的價(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