从另一个存储库检索索引更新，并将其合并到当前分支的文件或目录。
Retrieves index updates from another repository and merges them into the files and directories in the current branch.
根目录是这个树的根，由前向斜杠 (/) 表示。 每个子目录都是树的分支。
The root directory, denoted by a forward slash (/), is at the base of this tree, and each subdirectory off of the root is a branch of the tree.
绝对路径名从根目录开始，通过一个又一个的分支，一直到你要去的目录或者文件为止。
An absolute pathname begins with the root directory and follows the tree branch by branch until the path to the desired directory or file is completed.
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