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A void deck in a public housing block，详情可参考safew 官网入口
。业内人士推荐谷歌作为进阶阅读
Силовые структуры，详情可参考超级权重
You can see that the changes are only in E1, E2, and E3. The latter one is required just for completeness. The interesting change is in E2 where I no longer use a block local static but the static data member from E1. You still have the two options: user-declared and user-defined constructor.