A device that can be used to quickly seal the top of the well in the event of a well control event (kick).

一旦井控或井涌发生时，可以用于快速密封井眼上部的装置称为闸板式防喷器。

youdao

This "top kill" was meant to get enough mud into the pipes to seal the well and stop the flow of oil.

这种“灭顶法”是一种为了封闭油井，阻止油漏而将足够的重液打入管道的方法。

youdao

When K'ung Yu was promoted, the royal artisans cast a seal for him, but for some reason, it came out with a turtle on top, and the turtle was looking back over its shoulder.

孔玉升职以后，皇家工匠给他铸了一枚印章，但不知什么原因，每次铸成印章后，在印章的顶部，总有一只乌龟向后张望。

youdao

Each one had a seal at the top which was removed before it was fired, setting off a chemical reaction to produce oxygen as well as a lot of heat, the coroner heard.

BBC: Crew 'fought to save submariners'

Poor decision making prevented Holloway's team from scoring a fourth but they closed out the match to seal their place in the top flight.

BBC: Blackpool 3-2 Cardiff

The point was enough for Italy to seal top spot in the group and an automatic place in the World Cup finals.

BBC: Inexperience cost us - Trapattoni