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 approach things enthusastically and I don't like leaving things half done.
我热诚对待每件事，不喜欢半途而废。
The story Sam told wasn't very funny.
萨姆的故事一点意思也沒有。
Diamond necklaces and rings had been beautifully arranged on a background of black velvet.
钻石项链、戒指漂亮地陈列在黑色丝绒上面。