称量硬币时将硬币放在秤的一端，另一端则放已知重量的砝码，直至两端平衡。

To weigh the coin, it would be put on one side of scale, and counterweights of a known weight would be put on the other side until the scales balanced.

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他们用的是一组平衡秤。

They used a set of balancing scales to do this.

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文中以自动平衡数字秤为例，详细分析了数字秤各部分结构参数对系统动态性能的影响，并建立了数学模型。

Taking the self-poise digital balance as example, this paper analyses the influence of every part of digital balance on dynamical performance of a system, and builds up a mathematical model.

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