freight car without permanent sides or roof 同义词：flatbed, flat,
例句与用法
1.
He curls up in a flatcar and watches the sky . 他在一节平板车上蜷作一团、望着夜空。
2.
It can undertake the overhaul of many types of train , such as self - tipping train torpedo train , n17 flatcar sand & stone carriage 设施完备，技术力量强，主要承接机车解体大修用铁路自翻车、铁水车、 n17平车、砂石车的大修及上车制造业务。
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