an expression of approval or congratulation
赞扬；鼓励
they deserve a pat on the back for a job well done.
由于工作完成得非常好，所以他们应该得到庆贺。
express approval of or admiration for someone
对某人表示认可（或赞许）
have something memorized perfectly
完全记住，记得分毫不差
she has her answer off pat.
她把答案记得一字不漏。
(chiefly N. Amer.)stick stubbornly to one's opinion or decision
(主北美)坚持不变，固执己见；固守
many ranchers stood pat with the old strains of cattle.
许多农场主仍然固守原有牛的品种。
A word or gesture of praise or approval
赞扬：赞扬或同意的话或手势
received a pat on the back for doing a good job.
工作干得出色而得到赞扬