Idf
abbr. 综合资料文件（intergrated Data File）
🗣️ 情景例句
I love my school. I have so many good friends there now.
我喜欢我的学校。我现在有那么多好朋友在那里。
Don't forget to take care of him.
不要忘记照顾他。
we are now pretty certain the Earth is the only one on which life can survive.
我们目前可以肯定的是，地球是生命能存在的唯一行星。