1.   Before turning on the fan, spin the blades by hand to be sure that they rotate freely.

2.   Then, he gazed with satisfaction as its blades spun in the wind.

3.   When the blades spin, they will power a turbine generator in each tower hub.

4.   While the fan blades are spinning, each squeeze of the self-refilling bulb delivers small amounts of water into the enclosure of the hood.

5.   Sierra Leoneans stared as the Americans boarded the helicopters, on the grounds of the Mammy Yoko hotel, their rotor blades spinning.