The bicycle was an excellent laboratory for demonstrating how various machines work and children were able to see first hand the reason for axles, hub, spokes, and rim of wheels.
(The bicycle; was; an excellent laboratory for demonstrating how various machines work and children were able to see first hand the reason for axles, hub, spokes, and rim of wheels)
The bicycle
was
an excellent laboratory for demonstrating how various machines work and children were able to see first hand the reason for axles, hub, spokes, and rim of wheels