railroad tie

美 [ˈreɪlroʊd taɪ]英 [ˈreɪlrəʊd taɪ]

railroad tie

noun

one of the cross braces that support the rails on a railway track: the British call a railroad tie a sleeper; Synonym: tie crosstie sleeper

数据来源：WordNet

1

The British call a railroad tie a sleeper .

铁路枕木为什么是黑色的。
2

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。