类似地，LineItem类与产品对象也具有多对一关系。
Similarly, the LineItem class has a many-to-one relationship to the product object as well.
它们富含多酚类物质——一种使人看起来更年轻的抗氧化剂。
They contain polyphenols - antioxidants that help skin look younger.
多酚类物质：一大类具有抗氧化作用的植物化合物，在各种植物中分布广泛。
Polyphenols a broad class of antioxidant phytochemicals that are found throughout the plant kingdom.
单片机多串口通讯是一类较为特殊的应用。
Multi serial port communication is a kind of special application in single chip computer.
植物多酚是一类重要的生理活性物质。
Plant Polyphenols is a kind of important physiological activity material.
玛吉：你见到的是哪类损伤？有多严重？
这组成分占茶叶中总多酚类物质的80%。
This group constitutes 80 percent of the total polyphenols in tea.
而多胺类也是一类重要的植物生长物质。
Multiamine is also a sort of plant growth regulating substance.
而多胺类也是一类重要的植物生长物质。
Multiamine is also a sort of plant growth regulating substance.
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