Congested railways and ports have also been a problem, especially for coal and iron ore.
拥挤的铁路和港口也已经造成了问题，尤其是对煤矿业而言。
The area being talked about is very heavily congested with pigeons because the raptor problem became so great elsewhere that RACES have moved to east England.
出事区域有大量赛鸽，因为在其他地区肉食鸟的问题非常严重，所以比赛搬到了英格兰东部举行。
The congested traffic has become a serious problem for many cities with their steadily increasing population, and the construction of subways is viewed as an effective solution to the problem.
随着城市人口的不断增加，许多大城市都存在交通拥挤问题，而修建地铁又是非常有效的解决方法。
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