The spark plug must form a good seal inside the cylinder head to avoid leakage of without the high-tension current shorting-out.

火花塞必须在汽缸盖内形成良好密封以防止燃烧过程气体高压泄露，并且能够继续工作而且高压电路没有短路。

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Freezing rain can seal off your car and lock you inside.

冻雨会封住你的车，把你锁在车里。

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Take extra tape in your hand luggage – customs may need to look inside the box, and aren't required to help you seal it up again.

在你的随身行李箱中备好胶带-- 海关可能需要检查盒子里面的东西，而且他们不会帮你再封起来。

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Once the noodles are coated in that glorious sauce flecked with red pepper flakes, chopped parsley and scallions, seal them inside their parchment packets.

WSJ: Marc Vetri's Spaghetti in Parchment With Clams | Slow Food Fast

Burnley's first-half composure had disappeared and Spurs hit the Clarets again with two more goals inside three minutes to seal the victory - and almost certainly a place in a second successive final.

BBC: Tottenham 4-1 Burnley

All that was needed to make a mechanical energy-storage system was a good enough rotational seal, so the flywheel could spin freely inside a vacuum chamber with no air resistance.

ECONOMIST: Tech.view: Boost for Formula One | The