plugging
[plʌgɪŋ]
n.
（用木塞）堵漏;
v.
插上插头( plug的现在分词 );
以（塞子）塞住;
例句:
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My confidence is still there and I'll just keep plugging away.
我仍有信心，会继续坚持不懈。
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She keeps plugging away at French.
她一直在拼命地学法语.
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We did not want people on the show who are purely interested in plugging a book or film.
我们不想让那些只想为书或电影做广告的人上节目。
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Plugging in at work is of course quite positive.
来自SA
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Please stop plugging the site on the air.
来自BBC
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Workers stopped the flow only by permanently plugging the well.
来自WSJ