钢轨

gāng guǐ dǐ liè

钢轨底裂

basal crack in steel rail

gāng guǐ de gè bù fen bèi sòng zhì shí yàn shì jìn xíng yě jīn fēn xī

钢轨的各部分被送至实验室进行冶金分析。

Sections of the rails were sent to a laboratory for metallurgical analysis.