a casement window的用法和样例：
- A casement is a window that opened by means of hinge at the side.
- A casement is a window that opens by means of hinges at the side.
- The machine is mainly used for extrusion and connection of45° seam casement window with angle joint structure.
- PVC Casement window sereies:it can be opened large area,using the high quality hardware,opened nimbly,safe and reliable.