| 单词 | formation-level |
| 释义 | > as lemmasformation-level formation-level n. (see quot.). ΘΚΠ society > travel > rail travel > railway system or organization > [noun] > track > permanent way > level on which ballast is laid formation-level1888 1888 Lockwood's Dict. Mech. Engin. Formation Level, the level of the tops of the embankments and bottoms of the cuttings of a railway upon which the ballast is laid. < as lemmas |
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