英语翻译根目录的父目录This variable points at the base of the document tree on your web server.This code line uses..to mean "the parent directory of the document root directory".

英语翻译根目录的父目录This variable points at the base of the document tree on your web server.This code line uses..to mean "the parent directory of the document root directory".
英语翻译
根目录的父目录
This variable points at the base of the document tree on your web server.This code line uses..to mean "the parent directory of the document root directory".

英语翻译根目录的父目录This variable points at the base of the document tree on your web server.This code line uses..to mean "the parent directory of the document root directory".
FYI
所说的是文件目录的根目录,而父目录(parent directory)可能是文件目录的根目录的上层目录(不一定是文件目录)