Each production can also contain an action, enclosed in braces.
每个产品也可以包含一个用花括号括起的操作。
The commands in braces change the working directory of the current shell.
大括号中的命令更改了当前Shell的工作目录。
He wore leg braces after he had polio in childhood.
小时候患小儿麻痹症后，他使用了腿部支架。
Note the actions enclosed in { } braces, like a normal code block.
注意像普通的代码块那样封装在大括号 { }内的动作。
The first three years of his life were spent in surgery, casts and braces.
他生命的首三年都在与手术、石膏、箍架相伴。
In that case, the braces are optional.
在这种情况下，大括号是可选的。
In that case, the braces are optional.
在这种情况下，大括号是可选的。
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