The new sealing cap - similar to a smaller version of the damaged blow-outpreventer - has three devices that are designed to shut the flow.
新的密封帽类似一个较小版本的损坏井喷防护装置,有三个旨在关闭流量的装置。
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Following the explosion and fire on the rig, the blow-outpreventer on the sea bed should have automatically sealed the well, but it failed, resulting in the massive oil spill.
The well is still gushing, however. BP's technicians have been unable to activate the blow-outpreventer, essentially a massive valve that must be operated remotely by robot submarines.