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base tunnel中文是什么意思

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用"base tunnel"造句"base tunnel"怎么读"base tunnel" in a sentence

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百科解释

A base tunnel is a type of railway tunnel that is built through the base of a mountain pass. When originally constructed the "classical" lines through mountainous terrain tried to minimise tunelling, due to expense, often with the consequence of long and steep gradients and sharp curves.
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