在油井发生爆炸以及油井起火后，海底上的防喷器本来应该自动将油井封住，但是未能做到这一点，导致大规模的石油泄漏。

Following the explosion and fire on the rig, the blow-out preventer on the sea bed should have automatically sealed the well, but it failed, resulting in the massive oil spill.

youdao

应当为“深水地平线”钻井台石油泄漏事件负责的BP（英国石油公司）在5月26日开始用泵将重型钻井泥浆打入海底的阀门组（防喷器）中。

On May 26th BP, the company responsible for the well that Deepwater Horizon had drilled, started to pump heavy drilling mud into the well's blowout preventer, a set of valves on the sea floor.

youdao