All amino acids have this characteristic atomicgrouping (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)。
2
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。
3
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.