knock 指用拳头或其它器械猛敲或猛打；也指用手轻敲某物。
tap 多指慢慢地连续地轻击或轻拍。
rap 指用手指或木棒等快速地轻敲或急拍。
pat 指用手轻拍以示同情、赞同或爱抚。
参考例句
1. Her name is Pat. 她的名字叫帕特。
2. Pat is the kind of friend everyone dreams of. 帕特是那种每人都梦想得到的朋友。
3. Pat is not only a very accomplished guitar player, he is also a songwriter and singer. 他不仅是一位非常成功的吉他演奏家，他并且是歌曲作者和歌手。
英英解释
n.
1. the sound made by a gentle blow
2. a light touch or stroke v.
1. pat or squeeze fondly or playfully, especially under the chin
2. hit lightly adj.
1. having only superficial plausibility
2. exactly suited to the occasion adv.
1. completely or perfectly
网络释义
PAT 端口地址转换;
程分析技术;
Port Address Translation;
税后利润;
