But, psychologists say, grossly overtipping can also be a sign of a large ego ("look at this money I'm throwing around") or a thinly veiled attempt by an insecure person to buy approval.
FORBES: What Tipping Tells About Your Mate
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。