Let's start with the basic structural units of bone, called osteons.
让我们从骨骼的基本结构单元开始，称为骨单位。
2017级专外有声
Characteristics of Cancer .Abnormality .Cells are the structural units of all living things.
肿瘤的特征。异常。细胞是所有生物的结构单元。
英语百科
Structural unit
In polymer chemistry, a structural unit is a building block of a polymer chain. It is the result of a monomer which has been polymerized into a long chain.
There may be more than one structural unit in the repeat unit. When different monomers are polymerized, a copolymer is formed. It is a routine way of developing new properties for new materials.