| A | B |
|---|
| adaptation | to fir into a physical or social environment |
| thrust | movement caused by propellers |
| propellers | rotating devices that cause movement |
| to rotate | to turn around an axis |
| axis | a device use to hold a surface for rotating purpuses |
| analogous | similar |
| airfoil | a surface designed for flight |
| to steer | to move a vehicle in the desired direction |
| primaries | feathers attacherd to the bird's hand |
| ground-feeders | birds who feed on the ground |
| to glide | to fly without flapping the wings |
| to soar | to fly high in the sky |
| pliant | flexible |
