用英文介绍风扇的用处以及不可以接近之处

Question

用英文介绍风扇的用处以及不可以接近之处

Answer 1

A mechanical fan is an electrically powered device used to produce an airflow for the purpose of creature comfort (particularly in the heat),ventilation,exhaust,cooling or any other gaseous transport.
Mechanically,a fan can be any revolving vane or vanes used for producing currents of air.Fans produce air flows with high volume and low pressure,as opposed to a gas compressor which produces high pressures at a comparatively low volume.A fan blade will often rotate when exposed to an air stream,and devices that take advantage of this,such as anemometers and wind turbines often have designs similar to that of a fan.
The wind blade must nver be touched under circulation.Not only does it slow down the normal function of a fan,more importantly it will slice you fingers.Offcouse,the power line is also not a toy.Since the fan runs on electicity,safety precautions should always be needed.