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)。
The ichnofacies is the grouping of characteristic trace fossil association tending to rscirrence through a rather long interval of geologic time, and their environmental implication.
遗迹相是指一组具有特征的遗迹化石组合，在一段相当长的地质时期中不断的重视以及它们的环境意义。
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