采用自然单位和无量纲变换都是科研上常用的方法。
Both natural unit and dimensionless transformation are usual methods used in scientific research.
空泡射流的产生及射流冲击力的大小，由泡能和无量纲参数共同决定。
The generation and the impact force of cavitation liquid-jet depend on the bubble energy and non-dimension parameters.
对于非线性包装系统，系统参数和无量纲跌落冲击速度是产品跌落破损的评价量。
In non linear packaging system, the system parameter and dimensionless dropping shock velocity are the evaluation quantities.
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