封闭体系指与外部环境只有能量交换，而无物质交换的体系，称为封闭体系。
你痛恨苹果的封闭体系。
放射性物质容器弹和水槽组成的封闭体系具有恒定体积，而且是绝热的。
The closed system of bomb plus water bath has a constant volume and is thermally insulated.
概述了同位素封闭体系内的矿物氧扩散和同位素交换机制及其在地质速率计上的应用。
Oxygen diffusion in minerals and accompanied isotopic exchange inclosed systems are discussed with special application to geospeedometry.
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