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。
2
You can use a very Groovy-like set of nested configuration blocks to store your values in the configuration file.
您可以使用一组非常类似于Groovy的嵌套配置块在配置文件中存储您的值。
3
In the TDT you'll see two test action blocks with nested data.