枕木
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垫(diàn )铁(tiě )轨(guǐ )的(de )方(fāng )柱(zhù )形(xíng )横(héng )木(mù )。间(jiān )距(jù )相(xiàng )等(děng ),起(qǐ )着(zhe )固(gù )定(dìng )铁(tiě )轨(guǐ )和(hé )承(chéng )受(shòu )压(yā )力(lì )的(de )效(xiào )用(yòng )。今(jīn )亦(yì )以(yǐ )钢(gāng )筋(jīn )水(shuǐ )泥(ní )製(zhì )作(zuò )。
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