First, remote-controlled robot submarines have been deployed to try to seal off the oil well altogether by activating a massive device called a blowout preventer.
首先，他们已经部署了遥控机器人驾驶的潜水艇潜入水下试图通过激活防喷器来关闭油井。
A variety of schemes to either block up or seal off the blowout preventer are in development.
多种封闭或密封防喷装置的方案也在构思之中。
When the Deepwater Horizon sank, this riser collapsed and folded in on itself, but did not sheer off from the blowout preventer.
当钻井平台下沉时，立管倒塌，自动弯折，但不会转离防喷器。
The relief valve may be serviced while on or off the backflow preventer valve.
可以在防回流阀上维修安全阀，或将其从防回流阀拆卸下来维修。
The relief valve may be serviced while on or off the backflow preventer valve.
可以在防回流阀上维修安全阀，或将其从防回流阀拆卸下来维修。
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