system exist simultaneously
system exist simultaneously
系统同时存在
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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As an example of refinement of detail: A logic system may have two opposing inputs, e. g. , a command to open and a command to close, which do not normally exist simultaneously;
作为细节改进的示例：逻辑系统可以具有两个相反的输入，例如，通常不同时存在的打开命令和关闭命令；
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