n.填塞器；用功的学生；宣传员
John is the spark plug on his rowing team. 约翰是划船队的中坚分子。
You can plug into the national computer network. 你可以接通全国计算机网络。
The TV compere gave her new record a plug. 电视节目主持人极力推荐她的新唱片。
The wall plug is broken, isn't it? 墙上的插座坏了，不是吗？
It's hard to get at the spark plug without a proper wrench. 没有一把合适的扳钳，要抓住那个火花塞是困难的。
Pull (out) the plug and let the water drain away. 拔掉塞子，把水放掉。
