在内部块（inner block）中声明的变量不能在外部块（outer block）引用，也可以说，在嵌套块（nested block）里声明的变量不能在封闭块（enclosing block）引用，而在封闭块定义的变量可以在嵌套块...
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Thus, the "food chain" can be abandoned through the method of outer block and inner leading.
即通过外堵与内疏相结合的方法解决旅游团队“食物链”问题。
The trick is getting the table names array from the outer block into the inner block without explicitly passing it in somehow (which would have made the DSL ugly).
此处的技巧是：将表名数组从外部的block隐式地传递到内部的block中。用显式方式传递会让DSL看起来很丑陋。
Optional blocks can also be nested, in which case the inner optional block is only considered when the outer optional block's pattern matches the graph.
可选块也可以嵌套，在这种情况下，只有外部可选块的模式与图形匹配时，才考虑内部可选块。
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