英语翻译Windmills and wind turbines depend on the motion of air

英语翻译
Windmills and wind turbines depend on the motion of air currents or wind to turn some type of propeller or rotor to convert the wind energy into mechanical energy.It is this principle that is common to windmills of the past and present-day wind turbines.Today we call windmills wind turbines,as they are more sophisticated in design and construction.Wind turbines generally are classified into two major categories:horizontal-axis and vertical-axis machines.The most common design is the horizontal design as shown in Figure 5.These are three-blade turbines that are designed to face the oncoming wind.
When we look inside a wind turbine nacelle or housing,we can see a number of technological systems such as shown in Figure 6.These include a mechanical system of gears and shafts to modify the low speed of the rotor through a gear box to increase the generator shaft speed.The rotor is part of this mechanical system that converts the kinetic energy of the wind into mechanical energy.The wind moving across the blades of the rotor creates a "lift" and therefore rotation of the rotor.The generator is the heart of the generating system,as it is used to convert the mechanical energy of the wind acting on the rotor into electrical energy.There are sensors that determine the wind speed and wind direction.This information is channeled into a control system that orients the wind turbine into an optimal position facing the wind using a yaw control system.A braking system limits that rotational speed of the rotor to safe and acceptable speeds.A pitch control can alter the pitch of the rotor to control the speed and drive the generator.
As you can see,there are a number of mechanical,electrical and electronic,and structural systems that function together to harness the power of the wind.There are engineers,technologists,and technicians who design,operate,and maintain equipment such as these sophisticated wind turbines.Additionally,there are other business and support professionals concerned with personnel and business issues who require technological literacy to support their nontechnical job skills.