客户端的第二个请求到达时，再加载、执行处理该请求的块。
When the client’s second request arrives, the chunk that handles it is loaded and executed.
混凝土卸载及再加载的模型有直线式、折线式和曲线式等。
Concrete unloading and re-loading models consist of linear models, multi-linear models and curve models.
混凝土的反复加载应力-应变曲线不仅包括骨架曲线，还包括卸载及再加载曲线。
Concrete stress-strain curves under cyclic loads include not only envelope curve, but also unloading and re-loading curves.
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