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He opened the grey box, but found nothing in it.
他打开灰色盒子，里面什么也没有。
youdao
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This kind of control strategy is a guidance to grey-box system control.
这种控制策略，对灰箱系统控制有指导意义。
youdao
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This kind of control strategy is a guidance to grey-box system control.
这种控制策略，对灰箱系统控制有指导意义。
youdao