railroad tie
美 [ˈreɪlroʊd taɪ]英 [ˈreɪlrəʊd taɪ]
- 网络铁路枕木;铁路轨枕
![railroad tie](../cache/371320.jpg)
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The British call a railroad tie a sleeper .
铁路枕木为什么是黑色的。
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For a long time , some concrete structures usually can not be used because of lacking resistance of impact , such as different kinds of silo structure , pavement concrete , deck concrete , railroad tie , shaft , ore drop shaft as well as national defence establishment .
长期以来,在各种筒仓结构、路面混凝土、桥面混凝土、铁路枕木、矿石溜井以及国防设施等频繁承受动力荷载的结构中,混凝土通常是由于抗冲击性能的不足而丧失其使用性能。