The traditional method is suitable for a simple, single user (non-concurrent) system.
传统方法适合于简单的、单用户(非并发)系统。
DESIGN: Non-randomized concurrent control analysis.
设计：非随机化同期对照分析。
DESIGN: Non-randomized concurrent control experiment.
设计：非随机化同期对照实验。
DESIGN: Non-randomized concurrent control experiment.
设计：非随机化同期对照实验。
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