英语语法分析

The main part is made from expanded polytetrafluoroethylene.

主要部分，是由膨体聚四氟乙烯。

Sorts of fluororesins and the discovery of polytetrafluoroethylene are introduced.

简介氟树脂的种类和聚四氟乙烯的发现经过。

The chemical and physical characteristics and applications of polytetrafluoroethylene fiber are introduced.

介绍了聚四氟乙烯的化学、物理等特性及其应用。