n.抽吸；脉动
动词pump的现在分词.
Her heart was pumping very fast. 她的心脏跳得很快。
The pump sucks air out (of the vessel) through this valve. 这台泵通过这个阀门把(容器中的)空气抽出。
After several pumps, the water began to flow. 用泵抽了几下之后,水流出来了。
You will need to pump hard for several minutes to fill the tank. 你需用泵著实抽吸几分钟，才能把油箱灌满。
