The bigger the rotor blades, the more energy they can capture from the wind. The giant blades (typically 70 m or 230 feet in diameter, which is about 30 times the wingspan of an eagle) multiply the wind's force like a wheel and axle, so even a gentle breeze is enough to make the outer edges of the blades turn around.he same thing happens in a wind turbine, only the dynamo generator is driven by the turbine's rotor blades instead of by a bicycle wheel, and the lamp is a light in someone's home dozens of miles away. Read more in our main article about generators.
The fur trade is a worldwide industry dealing in the acquisition and sale of animal fur. Since the establishment of a world fur market in the early modern period, furs of boreal, polar and cold temperate mammalian animals have been the most valued.
Trade, commerce, traffic refer to the exchanging of commodities for other commodities or money. Trade is the general word: a brisk trade between the nations. Commerce applies to trade on a large scale and over an extensive area: international commerce. Traffic may refer to a particular kind of trade; but it usually suggests the travel, transportation, and activity associated with or incident to trade: the opium traffic; heavy traffic on the railroads.