level critical load 水平临界荷载
The load on this server has hit a critical level, and users and customers alike are complaining about performance.
此服务器上的负载已经达到了临界水平，用户和客户都对性能感到不满。
The lower-level problem is to maximize the loading margin under a load change direction and the upper-level problem is to find the closest critical point subject to the constraints of load change.
下层问题求解某个负荷变化方向上的最大负载裕度，上层问题考虑负荷变化方向的约束，寻找最近的电压稳定临界点。
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