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.
翻译：你有3个砝码：1公斤、3公斤和9公斤，以及一个托盘天平，你可以称出多少个不同的重量？
You have 3 weights:1 kg, 3 kg and 9 kg as well as an equal arm balance, as shown. How many different weight objects can you weigh with these three?
平衡天平两端盘中砝码的重量已极大增强。
The weights in each pan of the balance had increased greatly.
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