Assertion: airfoil's surface | /r/HasProperty | curved
Facets:
Source sentences:
text: If you look at an airplane from the side, you'll see that the upper surface of the wing is curved, and the lower surface is straighter.
text: Both the upper and lower surfaces were curved.
text: If you look at an airplane from the side, you’ll see that the upper surface of the wing is curved, and the lower surface is straighter.