The open and close brackets ([and]) mark the beginning and end of the code block, respectively.
开方括号和闭方括号([和])分别标志代码块的开始和结束。
At a rough level, you usually just want to automatically call a less specific rule at either the start or the end of execution of a code block.
在粗糙的层次上，您通常只想在开始或结束执行代码块时自动调用不太特定的规则。
In this case, I send the each message with the block of code between the do and end and have the next number in the range bound to the I parameter.
在这种情况下，我发送each消息，以及do和end之间的代码块，并且将范围中下一个数绑定到i参数上。
When loops hit the end of the loop or if it issues a continue, then that is the last thing it will do in that block of code.
当循环到达循环的末尾，或者它执行continue时，那是它在代码块中要做的最后一件事情。
When loops hit the end of the loop or if it issues a continue, then that is the last thing it will do in that block of code.
当循环到达循环的末尾，或者它执行continue时，那是它在代码块中要做的最后一件事情。
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