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。
The manual withdrawal device realizes the withdrawal and discharging on the withdrawal objects by driving the bottom frame and the blow off valve to move up and down through the pull rod.
本实用新型通过拉杆 带动底阀、排空阀的上、下运动，实现对抽取对象的抽取排出。
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