Idf
abbr. 綜合資料文件（intergrated Data File）
??? 情景例句
I maintain that the most important thing is having good friends.
我認(rèn)為最重要的是有好朋友。
All right, I will be waiting for you .
好的，我會(huì)等候你的。
And why only snakes? Cats, for instance, would be greatly helped; no running fights with large, fierce rats or tussles with grown rabbits -- just a bite and no more effort needed.
為什么只有蛇才有毒液呢？譬如說(shuō)，如果貓有毒液，那對(duì)貓會(huì)大有幫助，它就不必再和又大又兇的老鼠邊跑邊博斗了，也不必再和大兔子扭斗了，只要咬一口，就不必再費(fèi)大力氣。