烯
Definition
* 有机化学中表示的一类化合物。 乙～。丙～。聚乙～（高分子化合物，一种重要的塑料）
alkene
Structure
Related substructures
Precursors
Small Seal Script
Standardized 221–206 BCE (Qin); developed earlier in Qin
The standardized seal script promulgated after Qin’s unification, based on earlier Qin seal forms and used as an empire-wide norm.Wikipedia ->
