The ratio of the silver-109 isotope to silver-107 turned out to be much higher in New World silver than in the European COINS.
109同位素银和107同位素银在新世界银的比例要比来自欧洲的银币高很多。
The ratio of the silver-109 isotope to silver-107 turned out to be much higher in New World silver than in the European COINS.
109同位素银和107同位素银在新世界银的比例要比来自欧洲的银币高很多。
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