她又拿出了一枚硬币，放在第一枚硬币旁边维持平衡，然后又拿出一枚，直到有了一排硬币。
She took another coin and balanced it next to the first, and then another, until she had a line of coins.
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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