plastic是可数名词还是不可数名词?

Glass and plastic objects lined the shelves.

架子上排列着玻璃和塑料制品。

They manufacture the class of plastics known as thermoplastic materials

他们生产这类被称为热塑材料的'塑料制品。

Modern plastics can stand very high and very low temperatures.

新型塑料能承受很高和很低的温度。

It's real wood ─ not one of those plastic jobs.

这是实木的——不是那种塑料产品。

Plastic flowers have always been a particular hate of mine.

我一向特别厌恶塑料花。