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| 石碴床 | |||
| 道床; 道碴床; 道碴路床 | |||
| 石碴道床; 道碴路基 | |||
| 道砟道床; 有砟轨道道床 | |||
| 道砟床; 道床【铁】; 道砟路基; 碎石基床; 碎石道床; 石渣路基; 石渣道床 | |||
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ballast bed : 20 phrases in 4 subjects |
| Bridge construction | 3 |
| Construction | 1 |
| Rail transport | 5 |
| Technology | 11 |
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