求翻译：美国为主要的煤炭产量地和出口国,是有最丰富的煤炭资源的国家之一。根据英国石油公司的统计,在美国已探明煤炭储量居世界第一,达到4300亿吨。多年来,通过铁路煤炭作为主要的运输方式。目前总数的60%以上的国内和出口煤炭运输通过铁路运输,煤炭发货量铁路货运占40%。是什么意思？

US coal production is the main land and exporter, is one of the most abundant coal resources.

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US and the export state for the main coal output, has one of richest coal resources national.According to British Petroleum Company's statistics, have verified the coal reserves in US to occupy the world first, amounts to 430,000,000,000 tons.For many years, has taken the main transport mode the rai

United States is the main exporter of coal production and are one of the most abundant coal resources. Under the United Kingdom statistics for oil companies, in the United States proved coal reserves ranked first in the world to reach 430 billion tonnes. For years, coal as the main mode of transport

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