Their primary role is not computation, and often they have strict requirements regarding their physical scale (as is the case with handheld devices).
其主要作用不是计算，并且通常对其物理规模有严格的要求(与手持设备一样)。
Physical scale models for the Yellow River (YR) can be used to reproduce, simulate and test the phenomenon that happened on the real YR, so they can facilitate exposure of the natural laws concerned.
物理模型黄河”（简称“模型黄河”）可对“原型黄河”所反映的自然现象进行反演、模拟和试验，从而揭示其内在的自然规律。
Physical scale models for the Yellow River (YR) can be used to reproduce, simulate and test the phenomenon that happened on the real YR, so they can facilitate exposure of the natural laws concerned.
物理模型黄河”（简称“模型黄河”）可对“原型黄河”所反映的自然现象进行反演、模拟和试验，从而揭示其内在的自然规律。
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