n.(用木塞)堵漏；塞紧
动词plug的现在分词形式.
The outlets are conveniently placed for plugging in. 电源插座装在便于插插头的地方。
He has been plugging away at that article, for hours. 他已坚持了好几个小时写那篇文章。
They've been plugging his new show on the radio. 他们一直在电台上宣传他的新节目。
She's been plugging away at her French lessons for months. 她已刻苦攻读法语数月。
v. 拔去 ... 的塞子(障碍物)
