All amino acids have this characteristic atomic grouping (top right of Figure 3).

所有氨基酸都具有这种特有的原子分组特性(图3右侧)。

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Grouping is indicated by parentheses: any sub-expression contained in parentheses is treated as if it were atomic for the purpose of further grouping or repetition.

由括号表示分组：括号中包含的任何子表达式都被看作是用于以后分组或循环的原子。

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In this paper, amended rules are suggested for determining the order of atomic and ionic outer-shell orbital energy level and for grouping the atomic orbital energy level.

本文提出了改进的判断原子及离子外层轨道能级高低次序和划分轨道能级组的规则。

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