2．长城又称万里长城，实际长6，000多千米，高6-7米，宽4-5米，每隔几百米(every few hundred metres)就有一个烽火台（watchtower）。
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every few hundred metres
每隔几百米
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mobile bike mechanics set up camp every few hundred metres along the road, prepared to do a roaring trade in punctures and repairs.
BBC: Reclaiming the streets in Bogota
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