Parent step: move from a node to that node's parent.
父步骤：从一个节点移动到该节点的父节点。
In Step 11 the Customer notifies the profile that it is the profile's parent.
第11步Customer告知profile它是profile的父对象。
Then when it's time to tell a child that a parent has cancer, the next step is to think about what the child can handle at his or her particular age.
做好准备之后就该告诉孩子实情了，下面的步骤就是仔细考虑在孩子当前的年龄阶段他们可以驾驭什么。
The ftp_cdup() function changes the current directory to the parent directory (one step up).
函数的作用是：切换到当前目录的父目录（上一步）。
The ftp_cdup() function changes the current directory to the parent directory (one step up).
函数的作用是：切换到当前目录的父目录（上一步）。
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