taking a series of rhythmical steps (and movements) in time to music

a strong positive emotion of regard and affection

moving from one place to another and back again

forces acting on airfoils in motion relative to the air (or other gaseous fluids)

forces acting on airfoils in motion relative to the air (or other gaseous fluids)

with greater reason; for a still stronger, more certain reason

with greater reason; for a still stronger, more certain reason

with greater reason; for a still stronger, more certain reason

with greater reason; for a still stronger, more certain reason

with greater reason; for a still stronger, more certain reason