As well as the detrimental results flying had on a passengers' wallets in the 1930s, it also had a lasting effect on their hearing.

　　20世纪30年代，乘飞机的不但给了乘客巨大的经济压力，同时也对乘客的听力造成了永久伤害。

　　A flight in a Ford Tri-Motor aircraft, for example, saw the engines reach 120 decibels on take-off, just 40 decibels below the level that would result in permanent hearing loss - and because of the noise level, flight attendants had to speak to their passengers through megaphones.

　　以一架福特三引擎飞机为例，在起飞时发动机产生的噪音高达120分贝，比能够可以刺穿耳膜的声音仅仅低40分贝——由于噪音级数太高，飞行人员不得不用话筒来和乘客进行交流。