ventilation-perfusion-scan是什么意思

This would solve the problem of ventilation.ventilation为什么不加the?
还有 the British had not feared invasion.invasion为什么不加the?
下面是全文
In 1858,a French engineer,Aime Thome de Gamond,arrived in England with a plan for a twenty-one-mile tunnel under the English Channel.He said that it would be possible to build a platform in the centre of the Channel.This platform would serve as a port and a railway station.The tunnel would be well-ventilated if tall chimneys were built above sea level.In 1860,a better plan was put forward by an Englishman,William Low.He suggested that a double railway-tunnel should be built.This would solve the problem of ventilation,for if a train entered this tunnel,it would draw in fresh air behind it.Forty-two years later a tunnel was actually begun.If,at the time,the British had not feared invasion,it would have been completed.The world had to wait almost another 100 years for the Channel Tunnel.It was officially opened on March 7,1994,finally connecting Britain to the European continent

ventilation and air conditioning帮忙翻译下额,谢谢
5. AIR CONDITIONING
5.1. General Discussion and Considerations
Complete air conditioning is defined as the total control of the air distribution and airborne dust, odors, toxic gases, and bacteria within any structure. Partial air condi-tioning is primarily the control of the air environment by filtration and by removal or addition of heat. Cooling, however, is defined as a heat transfer unit operation used for the removal of heat.
The human body is continually adjusting to the effective temperature of the air in order to maintain itself at the proper temperature. Effective temperature is defined by the American Society of Heating. Refrigerating, and Air Conditioning Engineers

英语翻译
ventilation shaft
partition wall
skirting board
penthouse
lounge
fireplace
gutter flat roof

the ventilation phenomenon 这个现象汉语叫什么?
the ventilation phenomenon; the acceleration of water flow in the gap between the ice floe and the hull surface,and the flow of water to and from the gap as a result of changes in the geometry of the hull along the trajectory of an ice floe sliding against the hull.这个现象汉语叫什么