Pdf file
PDF文件
🧩 词语组成解析
abbr. 概率分部函数（Probability Distribution Function）
file
[faɪl]
vt. 提出（离婚诉讼或其他讼案）;把…归档;用锉锉;发稿，寄给报社;
vi. 发送（报道给报社）;排成一行行走;提出申请;
n. 文件（夹）;档案;纵列;锉刀;
fil线+e → 用线穿成的→ 档案
🗣️ 情景例句
I knew it! I knew it!
我就知道是这样 ，我就知道是这样！
Believe somebody on his bare word.
人言无据，切勿轻信。
It suddenly dawned on me that this express was not roaring down the line at ninety miles an hour, but barely chugging along at thirty.
我突然感到这趟快车并没以时速90英里的速度呼啸前进，而是卟哧卟哧地向前爬行，时速仅30英里。