There have been two failures: The shuttle Challenger and seven astronauts were lost just after launch in January 1986 due to an O-ring seal leak in a solid rocket booster that led to an explosion.

有两次失败的教训：1986年1月刚刚发射过后，一个固体火箭助推器的O型圈密封泄漏导致的爆炸，使我们失去了挑战者号和7名宇航员。

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The seal of this container is lost, so we can't accept it. It had to be shut out.

这个集装箱的铅封已经失落，我们不能接收，只得退关。

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After a long time, the main oil seal can be deformed; sealing effects can be reduced, and sealing functions can be even lost.

时间一长，会使主封油变形，降低密封效果，甚至失去密封功能。

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Indeed, the population of snow geese in the north has recently grown dramatically, and one study suggests that the abundance of goose nests could offset some of the nutrients lost because of a shorter seal-hunting season.

WSJ: Are Polar Bears Really Disappearing?

The Blues have lost just twice in 13 games and could seal a place in the new Magners League end-of-season play-offs should they beat defending league champions Munster at the Arms Park next Sunday and deny them a bonus point.

BBC: Cardiff Blues bid for Welsh European history