塑料管通常是通过挤压成型工艺制造的。

Plastic pipes are commonly made through the process of ___extrusion.

这些铝制挤压件用于制造窗户框架。

These aluminum ___extrusions are used to make window frames.

这些火山喷出物覆盖了周围数英里的区域。

The volcanic ___extrusions covered several miles of the surrounding area.