Backdoor file
[计] 秘密文件, 非法途径文件
🧩 词语组成解析
a. 秘密的
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
Speaking of promoting the book,
说起促销书的事
This kind of box is not suitable for the transport of the tea sets by sea.
这种箱子不适合装茶具海运。
It did not, however, remain within the confines of his estate.
然而，这种疾病并未被局限在他的庄园内，