The well is still gushing, however. BP's technicians have been unable to activate the blow-out preventer, essentially a massive valve that must be operated remotely by robot submarines.
钻井中的原油仍在涌出，但是BP的技工们却不能启动井喷防控装置，这个装置本质上是一个必须由机器人潜艇远程操控的巨大阀门。
Blow out lines to remove all loose scale and other foreign matter that can damage valve seat.
向管道吹气，清除所有疏松鳞锈和可能损害阀门阀座的其他外部杂质。
This valve is used on diverter systems and choke lines leading from the blow out preventers.
此阀用于分流系统和从防喷器引出的阻流管线上。
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