Thee vertical line is far less secure than the horizontal line, and thus more dynamic.
垂直线比起水平线没那么稳当，因此也更生动。
The mathematics model of general vertical-dynamic-balancing-machine is set up firstly.
本文首先建立了一般立式动平衡机的数学模型。
The mathematics model of general vertical-dynamic-balancing-machine is set up firstly.
本文首先建立了一般立式动平衡机的数学模型。
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