Block statements reduce the ambiguity that often arises when control constructs are nested, and they provide a mechanism for organizing the code for improved readability.

块语句减少了当控制结构嵌套时候可能引起的混淆，提供了一种提高代码可读性的组织机制。

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When control degree in the low benefit zone is less than 15%, there is almost no sediment reduction benefit.

减沙效益低值区的治理度小于15%时，基本没有减沙效益。

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When control degree in the low benefit zone is less than 15%, there is almost no sediment reduction benefit.

减沙效益低值区的治理度小于15%时，基本没有减沙效益。

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