单词	past perfect
释义	past perfect adjective : of, relating to, or constituting a verb tense that is traditionally formed in English with had and denotes an action or state as completed at or before a past time spoken of past perfect noun Word History First Known Use 1868, in the meaning defined above
随便看	switch box switch cane switch engine switch hook switch key switch knife switch knives switch lamp switch line switch lock switch off switch on switch plant switch plate switch plug switch point switch position switch rail switch shifts with switch shifts with someone switch sorrel switch stand switch tender switch tie switch tower

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。