adj.塞紧的；堵住的
动词plug的过去式和过去分词.
Have you plugged in yet? 你把插头插上了没有？
Computers could be plugged into a national network and be used like radios. 计算机可以通过插座与全国计算网络联接，就象用一架收音机一样。
The salesman plugged the new product. 那个推销员反覆宣传新产品。
The recorder wasn't plugged in. 录音机的插头没插上。
