valid operation的意思|示意

When the file system gets mounted, it is initially empty, and the only valid operation in its root directory is to create new directories with the mkdir system call.

当文件系统挂载到系统中之后，它最初是空的，在其根目录中唯一有效的操作就是使用 mkdir 系统调用创建一个新的目录。

Scholastic power and its valid operation results from the joint function of all relative factors.

学术权力及其有效地运行是各相关要素共同合力作用的结果。

As such, the only valid operation on an atom is a comparison.

因此，对于原子值，惟一合法的操作是比较。