Thus, in 1967, SI adopted a more precise definition based on the frequency of the radiation a caesium atom emits when it flips between two energy states.

所以，在1967年，SI采用了一个更为精确的制定办法，该办法基于一个铯原子在两个能级之间跃迁时的辐射频率。

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A real space atom cutting method is adopted to analyze the respective contributions of the cation and anionic groups to optical response.

采用实空间原子切割方法分析了阳离子和阴离子基团对光学性质的贡献。

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