2002年,管道运输处理了多达21百万吨的货物。

In 2002, pipeline transport handled as many as 21 million tonnes of goods.

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In 2002, pipeline transport handled as many as 21 million tonnes of goods.

as 在这里是副词,表示"同样地"或"达到某种程度"。 many 是形容词,表示"许多的"或"大量的"。 as many as 是一个固定短语,表示"多达"或"和...一样多",用于强调数量之大。

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