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。

youdao

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。

youdao

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。

youdao