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請各位知道的大大幫幫忙哦 !! Automobiles, trucks, buses, aircraft, industrial sources, and combustion of fossil fuels are major sources of CO, sulfur and nitrogen oxides, hydrocarbons, and particles. Areas with equal production of pollutants do not necessarily have equally polluted air, or smog, because climate and... 顯示更多 請各位知道的大大幫幫忙哦 !!

Automobiles, trucks, buses, aircraft, industrial sources, and combustion of fossil
fuels are major sources of CO, sulfur and nitrogen oxides, hydrocarbons, and
particles.

Areas with equal production of pollutants do not necessarily have equally polluted
air, or smog, because climate and topography play major roles.

River and mountain valleys generally have greater smog levels than hilltops and
plains.

High temperature and humidity typically promote photochemical smog with
associated high O3 levels.

For example, in the Los Angeles area, such smog, trapped by summer winds
toward the surrounding mountains, is a common phenomenon.

Low temperature with a concomitant increase in fuel consumption for heating and
high humidity (fog, rain) promote a different type of fog, in which high sulfur oxide
concentrations combined with particulate matter are converted into sulfuric acid
(acid rain) and sulfates.

The most famous fog of this type is the London fog, which produced a large
number of deaths in 1952 (4000 in a 4-day period).

Such fog can be persistent when temperature inversion occurs, a condition
brought about by little wind and a layer of cool polluted air trapped beneath a
laver of warmer air.

The speed of ascent and the absolute altitude are primary determinants of the
incidence of altitude illness.

Those exercising in or exposed to altitude (athletes and coaches) should
anticipate the hazards and prepare through prevention and recognition of
symptoms.

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