An unitary closedblock which is divided into small towers.
一个整体的封闭街区也可分成若干小塔楼。
2
Leaving the cursor conveniently in the middle of the newly closedblock.
让光标留在一对花括号的中间，从而为输入提供方便。
3
The scope between the name space of the environment that defines the code block and the function that USES it are essentially one scope: the scope is closed.