Assertion: glider's surface | /r/HasProperty | stretched across frame
Facets:
Source sentences:
text: Kites and some light weight gliders and airplanes have flexible wing surfaces which are stretched across a frame and made rigid by the lift forces exerted by the airflow over them.
text: Airplanes have flexible wing surfaces which are stretched across a frame and made rigid by the lift forces exerted by the airflow over them.