这两位化学家都非常有远见，他们对周期性的物理性质和化学性质进行分析，并在预示应该出现新元素的地方留下了空位。

Both chemists were sufficiently farsighted to leave gaps where their analyses of periodic physical and chemical properties indicated that new elements should be located.

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转移矩阵方法作为一个有力的工具，主要用于具有周期性结构的图的具有给定性质的子结构计数。

Transfer-matrix method is a useful tool. It mainly applies in the substructure enumeration of graphs which have good recurring structures and the substructure has prescribed properties.

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结果表明：由光场诱导的双模原子激光呈现周期性的压缩，原子间的相互作用和光场初始压缩因子对原子的压缩性质具有重要影响。

The results show that the atom appears periodically squeezing, and the squeezing properties of atom laser depend closely on both interaction among atoms in BEC and initial squeezing factor of light.

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And what we've been talking about with all of these properties are, of course, how can we figure out what that is for a certain atom by looking at the periodic table, so we want to think about the periodic trend for atomic radius.

对于我们讲过的这些性质，我们所讨论的一直都是,当然是，我们如何能够判断某一个原子的这些性质,通过观察周期表，因此我们需要思考一下原子半径的周期性规律。

麻省理工公开课 - 化学原理课程节选