（三）非正常损失的不动产，以及该不动产所耗用的购进货物和建筑服务；
Implementers shouldn't need to jump through these hoops. When you find yourself needing to relax or bypass spec semantics just to achieve reasonable performance, that's a sign something is wrong with the spec itself. A well-designed streaming API should be efficient by default, not require each runtime to invent its own escape hatches.
，这一点在safew官方下载中也有详细论述
let closed = false;，推荐阅读heLLoword翻译官方下载获取更多信息
🎯 适合人群：C语言学习者、数据结构初学者、面试准备者
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